<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,600" rel="stylesheet">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
        *,
        *:before,
        *:after {
            box-sizing: border-box;
        }

        :root {
            --white: #fff;
            --black: #000;
            --bg: #f8f8f8;
            --grey: #999;
            --dark: #1a1a1a;
            --light: #e6e6e6;
            --wrapper: 1000px;
            --blue: #00b0ff;
        }

        body {
            background-color: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            text-rendering: optimizeLegibility;
            font-family: 'Source Sans Pro', sans-serif;
            font-weight: 400;
            background-size: cover;
            background-repeat: none;
        }

        ul li {
            list-style-type: none;
        }

        .wrapper {
            position: fixed;
            left: 0;
            top: 0;
            width: var(--wrapper);
            height: 800px;
        }

        .container {
            position: fixed;
            top: 0;
            left: 0;
            width: 890px;
            height: 100%;
            background-color: var(--white);
        }

        .container .left {
            float: left;
            width: 37.6%;
            height: 100%;
            border: 1px solid var(--light);
            background-color: var(--white);
        }

        .container .left .top {
            position: relative;
            width: 100%;
            height: 96px;
            padding: 29px;
        }

        .container .left .top:after {
            position: absolute;
            bottom: 0;
            left: 50%;
            display: block;
            width: 80%;
            height: 1px;
            content: '';
            background-color: var(--light);
            -webkit-transform: translate(-50%, 0);
            transform: translate(-50%, 0);
        }

        .container .left input {
            float: left;
            width: 220px;
            height: 42px;
            padding: 0 15px;
            border: 1px solid var(--light);
            background-color: #eceff1;
            border-radius: 21px;
            font-family: 'Source Sans Pro', sans-serif;
            font-weight: 400;
        }

        .container .left input:focus {
            outline: none;
        }

        .container .left a.search {
            display: block;
            float: left;
            width: 42px;
            height: 42px;
            margin-left: 10px;
            border: 1px solid var(--light);
            background-color: var(--blue);
            background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/382994/name-type.png");
            background-repeat: no-repeat;
            background-position: top 12px left 14px;
            border-radius: 50%;
        }

        .container .left .people {
            margin-left: -1px;
            border-right: 1px solid var(--light);
            border-left: 1px solid var(--light);
            width: calc(100% + 2px);
            padding-left: 0px;
        }

        .container .left .people .person {
            position: relative;
            width: 100%;
            padding: 12px 10% 16px;
            cursor: pointer;
            background-color: var(--white);
        }

        .container .left .people .person:after {
            position: absolute;
            bottom: 0;
            left: 50%;
            display: block;
            width: 80%;
            height: 1px;
            content: '';
            background-color: var(--light);
            -webkit-transform: translate(-50%, 0);
            transform: translate(-50%, 0);
        }

        .container .left .people .person img {
            float: left;
            width: 40px;
            height: 40px;
            margin-right: 12px;
            border-radius: 50%;
        }

        .container .left .people .person .name {
            font-size: 14px;
            line-height: 22px;
            color: var(--dark);
            font-family: 'Source Sans Pro', sans-serif;
            font-weight: 600;
        }

        .container .left .people .person .time {
            font-size: 14px;
            position: absolute;
            top: 16px;
            right: 10%;
            padding: 0 0 5px 5px;
            color: var(--grey);
            background-color: var(--white);
        }

        .container .left .people .person .preview {
            font-size: 14px;
            display: inline-block;
            overflow: hidden !important;
            width: 70%;
            white-space: nowrap;
            text-overflow: ellipsis;
            color: var(--grey);
        }

        .container .left .people .person.active,
        .container .left .people .person:hover {
            margin-top: -1px;
            margin-left: -1px;
            padding-top: 13px;
            border: 0;
            background-color: var(--blue);
            width: calc(100% + 2px);
            padding-left: calc(10% + 1px);
        }

        .container .left .people .person.active span,
        .container .left .people .person:hover span {
            color: var(--white);
            background: transparent;
        }

        .container .left .people .person.active:after,
        .container .left .people .person:hover:after {
            display: none;
        }

        .container .right {
            position: relative;
            float: left;
            width: 62.4%;
            height: 100%;
        }

        .container .right .top {
            width: 100%;
            height: 47px;
            padding: 15px 29px;
            background-color: #eceff1;
        }

        .container .right .top span {
            font-size: 15px;
            color: var(--grey);
        }

        .container .right .top span .name {
            color: var(--dark);
            font-family: 'Source Sans Pro', sans-serif;
            font-weight: 600;
        }

        .container .right .chat {
            position: relative;
            display: none;
            overflow: hidden;
            padding: 0 35px 92px;
            border-width: 1px 1px 1px 0;
            border-style: solid;
            border-color: var(--light);
            height: calc(100% - 48px);
            -webkit-box-pack: end;
            justify-content: flex-end;
            -webkit-box-orient: vertical;
            -webkit-box-direction: normal;
            flex-direction: column;
        }

        .container .right .chat.active-chat {
            display: block;
            display: -webkit-box;
            display: flex;
        }

        .container .right .chat.active-chat .bubble {
            -webkit-transition-timing-function: cubic-bezier(0.4, -0.04, 1, 1);
            transition-timing-function: cubic-bezier(0.4, -0.04, 1, 1);
        }

        .container .right .chat.active-chat .bubble:nth-of-type(1) {
            -webkit-animation-duration: 0.15s;
            animation-duration: 0.15s;
        }

        .container .right .chat.active-chat .bubble:nth-of-type(2) {
            -webkit-animation-duration: 0.3s;
            animation-duration: 0.3s;
        }

        .container .right .chat.active-chat .bubble:nth-of-type(3) {
            -webkit-animation-duration: 0.45s;
            animation-duration: 0.45s;
        }

        .container .right .chat.active-chat .bubble:nth-of-type(4) {
            -webkit-animation-duration: 0.6s;
            animation-duration: 0.6s;
        }

        .container .right .chat.active-chat .bubble:nth-of-type(5) {
            -webkit-animation-duration: 0.75s;
            animation-duration: 0.75s;
        }

        .container .right .chat.active-chat .bubble:nth-of-type(6) {
            -webkit-animation-duration: 0.9s;
            animation-duration: 0.9s;
        }

        .container .right .chat.active-chat .bubble:nth-of-type(7) {
            -webkit-animation-duration: 1.05s;
            animation-duration: 1.05s;
        }

        .container .right .chat.active-chat .bubble:nth-of-type(8) {
            -webkit-animation-duration: 1.2s;
            animation-duration: 1.2s;
        }

        .container .right .chat.active-chat .bubble:nth-of-type(9) {
            -webkit-animation-duration: 1.35s;
            animation-duration: 1.35s;
        }

        .container .right .chat.active-chat .bubble:nth-of-type(10) {
            -webkit-animation-duration: 1.5s;
            animation-duration: 1.5s;
        }

        .container .right .write {
            position: absolute;
            bottom: 29px;
            left: 30px;
            height: 42px;
            padding-left: 8px;
            border: 1px solid var(--light);
            background-color: #eceff1;
            width: calc(100% - 58px);
            border-radius: 5px;
        }

        .container .right .write input {
            font-size: 16px;
            float: left;
            width: 405px;
            height: 40px;
            padding: 0 10px;
            color: var(--dark);
            border: 0;
            outline: none;
            background-color: #eceff1;
            font-family: 'Source Sans Pro', sans-serif;
            font-weight: 400;
        }

        .container .right .write .write-link.attach:before {
            display: inline-block;
            float: left;
            width: 20px;
            height: 42px;
            content: '';
            background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/382994/attachment.png");
            background-repeat: no-repeat;
            background-position: center;
        }

        .container .right .write .write-link.smiley:before {
            display: inline-block;
            float: left;
            width: 20px;
            height: 42px;
            content: '';
            background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/382994/smiley.png");
            background-repeat: no-repeat;
            background-position: center;
        }

        .container .right .write .write-link.send:before {
            display: inline-block;
            float: left;
            width: 20px;
            height: 42px;
            margin-left: 11px;
            content: '';
            background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/382994/send.png");
            background-repeat: no-repeat;
            background-position: center;
        }

        .container .right .bubble {
            font-size: 16px;
            position: relative;
            display: inline-block;
            clear: both;
            margin-bottom: 8px;
            padding: 13px 14px;
            vertical-align: top;
            border-radius: 5px;
        }

        .container .right .bubble:before {
            position: absolute;
            top: 19px;
            display: block;
            width: 8px;
            height: 6px;
            content: '\00a0';
            -webkit-transform: rotate(29deg) skew(-35deg);
            transform: rotate(29deg) skew(-35deg);
        }

        .container .right .bubble.you {
            float: left;
            color: var(--white);
            background-color: var(--blue);
            align-self: flex-start;
            -webkit-animation-name: slideFromLeft;
            animation-name: slideFromLeft;
        }

        .container .right .bubble.you:before {
            left: -3px;
            background-color: var(--blue);
        }

        .container .right .bubble.me {
            float: right;
            color: var(--dark);
            background-color: #eceff1;
            align-self: flex-end;
            -webkit-animation-name: slideFromRight;
            animation-name: slideFromRight;
        }

        .container .right .bubble.me:before {
            right: -3px;
            background-color: #eceff1;
        }

        .container .right .conversation-start {
            position: relative;
            width: 100%;
            margin-bottom: 27px;
            text-align: center;
        }

        .container .right .conversation-start span {
            font-size: 14px;
            display: inline-block;
            color: var(--grey);
        }

        .container .right .conversation-start span:before,
        .container .right .conversation-start span:after {
            position: absolute;
            top: 10px;
            display: inline-block;
            width: 30%;
            height: 1px;
            content: '';
            background-color: var(--light);
        }

        .container .right .conversation-start span:before {
            left: 0;
        }

        .container .right .conversation-start span:after {
            right: 0;
        }

        @keyframes slideFromLeft {
            0% {
                margin-left: -200px;
                opacity: 0;
            }

            100% {
                margin-left: 0;
                opacity: 1;
            }
        }

        @-webkit-keyframes slideFromLeft {
            0% {
                margin-left: -200px;
                opacity: 0;
            }

            100% {
                margin-left: 0;
                opacity: 1;
            }
        }

        @keyframes slideFromRight {
            0% {
                margin-right: -200px;
                opacity: 0;
            }

            100% {
                margin-right: 0;
                opacity: 1;
            }
        }

        @-webkit-keyframes slideFromRight {
            0% {
                margin-right: -200px;
                opacity: 0;
            }

            100% {
                margin-right: 0;
                opacity: 1;
            }
        }
    </style>
</head>

<body>
    <div class="wrapper">
        <div class="container">
            <div class="left">
                <div class="top">
                    <input type="text" placeholder="Search" />
                    <a href="javascript:;" class="search"></a>
                </div>
                <ul class="people">
                    <li class="person" data-chat="person1">
                        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/382994/thomas.jpg" alt="" />
                        <span class="name">Thomas Bangalter</span>
                        <span class="time">2:09 PM</span>
                        <span class="preview">I was wondering...</span>
                    </li>
                    <li class="person" data-chat="person2">
                        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/382994/dog.png" alt="" />
                        <span class="name">Dog Woofson</span>
                        <span class="time">1:44 PM</span>
                        <span class="preview">I've forgotten how it felt before</span>
                    </li>
                    <li class="person" data-chat="person3">
                        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/382994/louis-ck.jpeg" alt="" />
                        <span class="name">Louis CK</span>
                        <span class="time">2:09 PM</span>
                        <span class="preview">But we’re probably gonna need a new carpet.</span>
                    </li>
                    <li class="person" data-chat="person4">
                        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/382994/bo-jackson.jpg" alt="" />
                        <span class="name">Bo Jackson</span>
                        <span class="time">2:09 PM</span>
                        <span class="preview">It’s not that bad...</span>
                    </li>
                    <li class="person" data-chat="person5">
                        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/382994/michael-jordan.jpg" alt="" />
                        <span class="name">Michael Jordan</span>
                        <span class="time">2:09 PM</span>
                        <span class="preview">Wasup for the third time like is
                            you blind bitch</span>
                    </li>
                    <li class="person" data-chat="person6">
                        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/382994/drake.jpg" alt="" />
                        <span class="name">Drake</span>
                        <span class="time">2:09 PM</span>
                        <span class="preview">howdoyoudoaspace</span>
                    </li>
                </ul>
            </div>
            <div class="right">
                <div class="top"><span>To: <span class="name">Dog Woofson</span></span></div>
                <div class="chat" data-chat="person1">
                    <div class="conversation-start">
                        <span>Today, 6:48 AM</span>
                    </div>
                    <div class="bubble you">
                        Hello,
                    </div>
                    <div class="bubble you">
                        it's me.
                    </div>
                    <div class="bubble you">
                        I was wondering...
                    </div>
                </div>
                <div class="chat" data-chat="person2">
                    <div class="conversation-start">
                        <span>Today, 5:38 PM</span>
                    </div>
                    <div class="bubble you">
                        Hello, can you hear me?
                    </div>
                    <div class="bubble you">
                        I'm in California dreaming
                    </div>
                    <div class="bubble me">
                        ... about who we used to be.
                    </div>
                    <div class="bubble me">
                        Are you serious?
                    </div>
                    <div class="bubble you">
                        When we were younger and free...
                    </div>
                    <div class="bubble you">
                        I've forgotten how it felt before
                    </div>
                </div>
                <div class="chat" data-chat="person3">
                    <div class="conversation-start">
                        <span>Today, 3:38 AM</span>
                    </div>
                    <div class="bubble you">
                        Hey human!
                    </div>
                    <div class="bubble you">
                        Umm... Someone took a shit in the hallway.
                    </div>
                    <div class="bubble me">
                        ... what.
                    </div>
                    <div class="bubble me">
                        Are you serious?
                    </div>
                    <div class="bubble you">
                        I mean...
                    </div>
                    <div class="bubble you">
                        It’s not that bad...
                    </div>
                    <div class="bubble you">
                        But we’re probably gonna need a new carpet.
                    </div>
                </div>
                <div class="chat" data-chat="person4">
                    <div class="conversation-start">
                        <span>Yesterday, 4:20 PM</span>
                    </div>
                    <div class="bubble me">
                        Hey human!
                    </div>
                    <div class="bubble me">
                        Umm... Someone took a shit in the hallway.
                    </div>
                    <div class="bubble you">
                        ... what.
                    </div>
                    <div class="bubble you">
                        Are you serious?
                    </div>
                    <div class="bubble me">
                        I mean...
                    </div>
                    <div class="bubble me">
                        It’s not that bad...
                    </div>
                </div>
                <div class="chat" data-chat="person5">
                    <div class="conversation-start">
                        <span>Today, 6:28 AM</span>
                    </div>
                    <div class="bubble you">
                        Wasup
                    </div>
                    <div class="bubble you">
                        Wasup
                    </div>
                    <div class="bubble you">
                        Wasup for the third time like is <br />you blind bitch
                    </div>

                </div>
                <div class="chat" data-chat="person6">
                    <div class="conversation-start">
                        <span>Monday, 1:27 PM</span>
                    </div>
                    <div class="bubble you">
                        So, how's your new phone?
                    </div>
                    <div class="bubble you">
                        You finally have a smartphone :D
                    </div>
                    <div class="bubble me">
                        Drake?
                    </div>
                    <div class="bubble me">
                        Why aren't you answering?
                    </div>
                    <div class="bubble you">
                        howdoyoudoaspace
                    </div>
                </div>
                <div class="write">
                    <a href="javascript:;" class="write-link attach"></a>
                    <input type="text" />
                    <a href="javascript:;" class="write-link smiley"></a>
                    <a href="javascript:;" class="write-link send"></a>
                </div>
            </div>
        </div>
    </div>
</body>
<script>
    document.querySelector('.chat[data-chat=person2]').classList.add('active-chat');
    document.querySelector('.person[data-chat=person2]').classList.add('active');

    let friends = {
        list: document.querySelector('ul.people'),
        all: document.querySelectorAll('.left .person'),
        name: ''
    },

        chat = {
            container: document.querySelector('.container .right'),
            current: null,
            person: null,
            name: document.querySelector('.container .right .top .name')
        };


    friends.all.forEach(f => {
        f.addEventListener('mousedown', () => {
            f.classList.contains('active') || setAciveChat(f);
        });
    });

    function setAciveChat(f) {
        friends.list.querySelector('.active').classList.remove('active');
        f.classList.add('active');
        chat.current = chat.container.querySelector('.active-chat');
        chat.person = f.getAttribute('data-chat');
        chat.current.classList.remove('active-chat');
        chat.container.querySelector('[data-chat="' + chat.person + '"]').classList.add('active-chat');
        friends.name = f.querySelector('.name').innerText;
        chat.name.innerHTML = friends.name;
    }
    //# sourceURL=pen.js
</script>

</html>