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HTML 

              
                <div class="info-panel">
            <div class="info-title">
                <h1>Chat Widget</h1>
                <h2> <a target="_new" href="https://www.andrewhaine.co.uk">Andrew Haine</a></h2>
            </div>
        </div>
        <div class="phone-canvas">
            <div class="chat-ui-canvas">
                <div id="header" class="header header-scrolled">
                    <div class="top-icons">
                        <div class="back-arrow">
                            <div class="back-arrow-line back-arrow-line-1"></div>
                            <div class="back-arrow-line back-arrow-line-2"></div>
                            <div class="back-arrow-line back-arrow-line-3"></div>
                        </div>
                        <div class="phone-icon">
                            <img src="https://i.imgur.com/4OTkocV.png" height="50%">
                        </div>
                    </div>
                    <div class="user-header-image"></div>
                    <div class="user-name-header"><h1>Arthur Johnson</h1></div>
                </div>
                <div id="message-feed" class="message-feed message-feed-unscrolled">
                    <div class="message message-from">
                        <div class="message-name"><h1>Arthur</h1></div>
                        <div class="message-body">
                            <p>
                                Put a bird on it wolf gentrify retro forage freegan craft beer ramps, mlkshk cold-pressed listicle before they sold out +1 slow-carb.
                            </p>
                        </div>
                        <div class="message-timestamp">
                            <p>Today 10:02</p>
                        </div>
                    </div>
                    <div class="message message-to">
                        <div class="message-name"><h1>You</h1></div>
                        <div class="message-body">
                            <p>
                                Tumblr meh chartreuse, messenger bag hammock heirloom bicycle rights pour-over fingerstache. Next level selfies kickstarter, vice gentrify pinterest whatever heirloom occupy ramps direct trade celiac +1.
                            </p>
                        </div>
                        <div class="message-timestamp">
                            <p>Today 10:14</p>
                        </div>
                    </div>
                    <div class="message message-from">
                        <div class="message-name"><h1>Arthur</h1></div>
                        <div class="message-body">
                            <p>
                                Viral portland thundercats readymade wayfarers man bun. Bespoke semiotics vegan, chia asymmetrical shabby chic quinoa man braid wayfarers
                            </p>
                        </div>
                        <div class="message-timestamp">
                            <p>Today 10:20</p>
                        </div>
                    </div>
                </div>
                <div class="message-input-bar">
                    <div id="media-expand-arrow" class="media-expand-arrow">
                        <div class="media-expand-arrow-line media-expand-arrow-line-1"></div>
                        <div class="media-expand-arrow-line media-expand-arrow-line-2"></div>
                        <div class="media-expand-arrow-line media-expand-arrow-line-3"></div>
                    </div>
                    <div class="message-text-input">
                        <form class="message-send">
                            <textarea id="message-input" placeholder="Message..." value=""></textarea>
                        </form>
                    </div>
                </div>
                <div id="media-bar" class="media-bar">
                    <div class="media-bar-header">
                        <div class="media-bar-title">               <h1>Media</h1>
                        </div>
                        <div id="media-bar-cross" class="media-close">
                            <div class="media-close-line media-close-line-1"></div>
                            <div class="media-close-line media-close-line-2"></div>
                        </div>
                    </div>
                    <div class="media-bar-body">
                        <div class="media-buttons-canvas">
                            <div class="media-button media-video">
                                <img src="https://imgur.com/x9NDjYV.png">
                            </div>
                            <div class="media-button media-image">
                                <img src="https://imgur.com/0Sw4F6i.png">
                            </div>
                            <div class="media-button media-audio">
                                <img src="https://imgur.com/2KlzOiN.png">
                            </div>
                            <div class="media-button media-location">
                                <img src="https://imgur.com/OvqVDk5.png">
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
!

CSS 

              
                @charset "utf-8"
@import url(https://fonts.googleapis.com/css?family=Lato:200,300,400,100,700)
@import url(https://fonts.googleapis.com/css?family=Bubblegum+Sans)
/*Font in PSD is Open Sans, I had to use Lato in order to get the desired font-weight for the header.
/* any elements with a commented out background color can be un-commented to see the guides

$bodyBack: rgb(51, 102, 153)
body
    position: relative
    overflow-x: hidden
    background-color: darken($bodyBack, 5%)
.info-panel * 
    font-family: 'Bubblegum Sans', cursive
    color: white
    font-weight: 200
.info-panel
    position: relative
    float: left
    padding-left: 5%
    padding-top: 2%
    width: 30%
    .info-title
        h1
            font-size: 4em
.phone-canvas
    position: relative
    margin: 0 auto
    width: 25vw
    height: 44.5vw
    min-width: 500px
    min-height: 889px
.chat-ui-canvas
    position: relative
    margin: 0 auto
    width: 19vw
    height: 33.5vw
    min-width: 340px
    min-height: 604px
    background-image: url("https://i.imgur.com/eKHNpIu.png")
    background-size: cover
    overflow: hidden
    top: 3vw
    border: 8px white solid
    border-radius: 20px
    box-shadow: 3px 3px 3px 
.header
    outline: white 3px solid
    position: relative
    top: 0px
.header.header-unscrolled
    height: 39%
    transition: height 0.5s ease-in-out
    .top-icons
        height: 23%
        width: 100%
        position: relative
        top: 3%
        padding: 0px
        transition: height 0.5s ease-in-out
        .back-arrow
            position: relative
            display: inline-block
            height: 100%
            width: 20%
            padding: 0px
            cursor: pointer
            .back-arrow-line
                transition: all 0.1s ease-in-out
                position: absolute
                width: 5%
                background-color: #ffffff
                padding: 0px
            .back-arrow-line-1
                transform: rotate(50deg)
                left: 32%
                top: 21.8%
                height: 30%
            .back-arrow-line-2
                transform: rotate(-50deg)
                left: 32%
                height: 30%
                top: 37.5%
            .back-arrow-line-3
                left: 48%
                top: 20%
                transform: rotate(90deg)
                height: 50%
            &:hover
                .back-arrow-line-1
                    left: 25%
                .back-arrow-line-2
                    left: 25%
                .back-arrow-line-3
                    left: 40%
        .phone-icon
            height: 100%
            width: 20%
            position: relative
            left: 60%
            display: inline-block
            cursor: pointer
            opacity: 1
            transition: opacity 0.2s ease-in-out
            img
                position: absolute
                margin: 0 auto
                top: 20%
                left: 25%
                transition: all 0.1s ease-in-out
            &:hover
                img
                    transform: scale(1.1)
    .user-header-image
        width: 31%
        opacity: 1
        transition: opacity 0.3s ease-in-out
        transition-delay: 0.3s
        background-image: url("https://i.imgur.com/Tl5p1Wb.png")
        background-size: cover
        top: -5%
        height: 45%
        position: relative
        margin: 0 auto
        border: 4px white solid
        border-radius: 100%
        overflow: hidden
        box-shadow: 1px 1px 5px #3c3c3c
    .user-name-header
        position: relative
        width: 100%
        bottom: 5%
        top: -7%
        transition: top 0.5s ease-in-out
        transition-delay: 0.1s
        h1
            text-align: center
            font-family: 'Lato', sans-serif
            font-weight: 300
            color: white
            font-size: 2.5em
            transition: all 0.5s ease-in-out
.header.header-scrolled
    height: 13%
    transition: height 0.5s ease-in-out
    .top-icons
        height: 69%
        transition: height 0.5s ease-in-out
        transition-delay: 0.1s
        width: 100%
        position: relative
        top: 3%
        padding: 0px
        .back-arrow
            position: relative
            display: inline-block
            height: 100%
            width: 20%
            top: 27%
            padding: 0px
            cursor: pointer
            .back-arrow-line
                transition: all 0.1s ease-in-out
                position: absolute
                width: 5%
                background-color: #ffffff
                padding: 0px
            .back-arrow-line-1
                transform: rotate(50deg)
                left: 32%
                top: 21.8%
                height: 30%
            .back-arrow-line-2
                transform: rotate(-50deg)
                left: 32%
                height: 30%
                top: 37.5%
            .back-arrow-line-3
                left: 48%
                top: 20%
                transform: rotate(90deg)
                height: 50%
            &:hover
                .back-arrow-line-1
                    left: 25%
                .back-arrow-line-2
                    left: 25%
                .back-arrow-line-3
                    left: 40%
        .phone-icon
            height: 100%
            width: 20%
            position: relative
            left: 60%
            display: inline-block
            cursor: pointer
            opacity: 0
            transition: opacity 0.2s ease-in-out
            img
                position: absolute
                margin: 0 auto
                top: 20%
                left: 25%
                transition: all 0.1s ease-in-out
            &:hover
                img
                    transform: scale(1.1)
    .user-header-image
        opacity: 0
        transition: opacity 0.3s ease-in-out
    .user-name-header
        position: relative
        width: 100%
        bottom: 5%
        top: -65%
        transition: top 0.6s ease-in-out
        transition-delay: 0.1s
        h1
            text-align: center
            font-family: 'Lato', sans-serif
            font-weight: 300
            color: white
            font-size: 2em
            transition: all 0.5s ease-in-out
.message-feed.message-feed-scrolled
    height: 77% !important
.message-feed::-webkit-scrollbar
    //background-color: green
    background-color: transparent
    width: 2%
.message-feed::-webkit-scrollbar-thumb
    background-color: transparent
    border-radius: 80px
    transition: background-color 0.2s ease-in-out
.message-feed:hover::-webkit-scrollbar-thumb
    background-color: #868686
    transition: background-color 0.2s ease-in-out
.message-feed
    position: relative
    width: 100%
    bottom: 0px !important
    height: 51%
    overflow-y: scroll
    overflow-x: hidden
    .message *
        margin: 0 auto
    .message
        margin-left: 2%
        position: relative
        width: 90%
        border-bottom: 1px white solid
        padding: 1%
        padding-left: 5%
        padding-right: 5%
        display: block
        .message-name
            position: relative
            width: 95%
            padding: 0px
            top: 0px
            display: block
            h1
                font-family: 'Lato', sans-serif
                color: white
                font-weight: 700
                font-size: 1.4em
                height: 100%
                margin: 1%
                margin-top: 3%
        .message-body
            position: relative
            width: 80%
            top: 0px
            display: block
            word-break: break-all
            p
                font-family: 'Lato', sans-serif
                color: white
                font-weight: 300
                font-size: 0.8em
                margin: 1%
        .message-timestamp
            position: relative
            width: 95%
            top: 0px
            display: block
            p
                font-family: 'Lato', sans-serif
                color: white
                font-weight: 700
                font-size: 0.7em
                margin: 1%
                margin-top: 3%
                margin-bottom: 3%
    .message.message-to *
        text-align: right
        margin-right: 0px
    .message.message-from *
        margin-left: 0px
.message-input-bar
    position: absolute
    z-index: 3
    background: rgba(0, 0, 0, 0.3)
    outline: white 3px solid
    width: 100%
    height: 10%
    bottom: 0px !important
    box-sizing: border-box
    margin: 0px
    .media-expand-arrow
        position: absolute
        display: inline-block
        width: 20%
        height: 100%
        top: 0px
        //background-color: green
        cursor: pointer
        .media-expand-arrow-line
            transition: all 0.1s ease-in-out
            position: absolute
            width: 5%
            background-color: #ffffff
            padding: 0px
            transition: all 0.1s ease-in-out
        .media-expand-arrow-line-1
            transform: rotate(50deg)
            left: 39%
            top: 16%
            height: 25%
        .media-expand-arrow-line-2
            transform: rotate(-50deg)
            left: 52%
            height: 25%
            top: 16%
        .media-expand-arrow-line-3
            left: 45.3%
            top: 20.5%
            height: 46%
        &:hover
            .media-expand-arrow-line-1
                top: 10%
            .media-expand-arrow-line-2
                top: 10%
            .media-expand-arrow-line-3
                top: 15%   
    .message-text-input
        display: inline-block
        //background-color: red
        box-sizing: border-box
        margin: 0px
        position: absolute
        width: 80%
        height: 100%
        right: 0px
        form
            width: 100%
            height: 100%
            position: relative
            textarea
                position: relative
                margin: 0 auto
                width: 90%
                height: 40%
                left: 0%
                top: 17%
                font-size: 1.2em
                font-family: "lato", sans-serif
                padding-left: 2%
                overflowY: scroll
                resize: none
                border-radius: 0px !important
                
.media-bar
    position: relative
    background-color: #e8e8e8
    width: 100%
    top: 100%
    height: 25%
    z-index: 4
    transition: all 0.4s ease-in-out
    .media-bar-header
        width: 100%
        height: 30%
        position: relative
        background-color: #363636
        .media-bar-title
            position: relative
            width: 40%
            //background-color: red
            height: 100%
            padding-left: 3%
            h1
                font-family: 'Lato', sans-serif
                color: white
                font-size: 2em
                line-height: 1.3em
                font-weight: 300
                padding-left: 6%
        .media-close
            //background-color: green
            position: relative
            height: 100%
            width: 17%
            top: -100%
            left: 83%
            cursor: pointer
            .media-close-line
                position: absolute
                background-color: #ffffff
                width: 6%
                height: 75%
                top: 10%
                transition: all 0.2s ease-in-out
            .media-close-line-1
                transform: rotate(45deg)
                left: 50%
            .media-close-line-2
                transform: rotate(-45deg)
                left: 50%
            &:hover
                .media-close-line
                    height: 90%
                    top: 0
                    transition: all 0.2s ease-in-out
    .media-bar-body
        position: relative
        width: 100%
        height: 70%
        top: 0%
        //background-color: blue
        .media-buttons-canvas
            height: 80%
            top: 10%
            width: 95%
            margin: 0 auto
            position: relative
            //background-color: brown
            padding: 0px
            .media-button
                width: 25%
                position: relative
                height: 100%
                display: block
                padding: 0px
                float: left
                cursor: pointer
                img
                    width: 90%
                    left: 5%
                    top: 5%
                    position: relative
                    filter: grayscale(100%)
                    -webkit-filter: grayscale(100%)
                    transition: all 0.3s ease-in-out
                    &:hover
                        filter: grayscale(0%)
                        -webkit-filter: grayscale(0%)
                        transition: all 0.3s ease-in-out
            .media-button.media-audio
                img
                    filter: brightness(150%)
                    -webkit-filter: grayscale(100%) brightness(150%)
                    &:hover
                        filter: brightness(150%)
                        -webkit-filter: grayscale(0%)   
.media-bar.media-bar-open
    top: -17.6% !important
    transition: top 0.5s ease-in-out
!

JS 

              
                window.onload = function () {
    var mediaExpand = document.getElementById("media-expand-arrow");
    var mediaBar = document.getElementById("media-bar");
    var mediaCross = document.getElementById("media-bar-cross");
    var messageFeed = document.getElementById("message-feed");
    
    console.log(mediaExpand + mediaBar);
    
    function mediaOpen(){
        mediaBar.className += " media-bar-open"
    };
    
    mediaExpand.addEventListener("click", mediaOpen, false);
    
    function mediaClose(){
        mediaBar.className = "media-bar"
    };
    
    mediaCross.addEventListener("click", mediaClose, false);
    
    function wScroll(){
        console.log(messageFeed.scrollTop);
        
        messageHeight = messageFeed.offsetHeight;
    
        var heightToScroll = (130);
        var header = document.getElementById('header');
    
        if(messageFeed.scrollTop > heightToScroll){
            header.className = "header header-scrolled"
            messageFeed.className = "message-feed message-feed-scrolled"
        }
        else if(messageFeed.scrollTop < 1){
            header.className = "header header-unscrolled"
            messageFeed.className = "message-feed"
        }
     };
    
    messageFeed.addEventListener("scroll", wScroll, false);
    
    wScroll();
        
        
    function logMessage(event){
        
        //get time
        function addZero(i){
            if(i < 10){
                i = "0" + i    
            }
            return i;
        }
    
        var d = new Date();    
        var h = addZero(d.getHours());
        var m = addZero(d.getMinutes()); 
        
        //build message
        
        function appendMessage() {
            $('#message-feed').append(
                '<div class="message message-to"><div class="message-name"><h1>You</h1></div><div class="message-body"><p>' + messageVal + '</p></div><div class="message-timestamp"><p>Today ' + h + ' : ' + m + '</p></div>'   
            );
        }
        
        //set event trigger
        
        var messageInput = document.getElementById("message-input");
        
        var messageVal = messageInput.value;
        
        //hipsum responses
        
        var responseTimed;
        
        function timedResponse(){
            setTimeout(
            function appendResponse() {
                var randNumber = Math.floor((Math.random()*10)+1)

                switch(randNumber){
                    case 1:
                        $('#message-feed').append(
                            '<div class="message message-from"><div class="message-name"><h1>Arthur</h1></div><div class="message-body"><p>Gluten-free VHS gentrify, humblebrag blue bottle retro vegan yuccie swag etsy.</p></div><div class="message-timestamp"><p>Today ' + h + ' : ' + m + '</p></div>'   
                        );
                        break;
                    case 2:
                        $('#message-feed').append(
                            '<div class="message message-from"><div class="message-name"><h1>Arthur</h1></div><div class="message-body"><p>Tilde ethical offal plaid everyday carry meggings banjo gentrify, green juice food truck fap. Beard lumbersexual photo booth.</p></div><div class="message-timestamp"><p>Today ' + h + ' : ' + m + '</p></div>'   
                        );
                        break;
                    case 3:
                        $('#message-feed').append(
                            '<div class="message message-from"><div class="message-name"><h1>Arthur</h1></div><div class="message-body"><p>Cliche sriracha jean shorts, cronut beard irony meh asymmetrical man braid offal.</p></div><div class="message-timestamp"><p>Today ' + h + ' : ' + m + '</p></div>'   
                        );
                        break;
                    case 4:
                        $('#message-feed').append(
                            '<div class="message message-from"><div class="message-name"><h1>Arthur</h1></div><div class="message-body"><p>Quinoa man braid tumblr venmo lomo cray microdosing, pinterest celiac affogato fingerstache umami fashion axe schlitz. Ethical four loko truffaut salvia.</p></div><div class="message-timestamp"><p>Today ' + h + ' : ' + m + '</p></div>'   
                        );
                        break;
                    case 5:
                        $('#message-feed').append(
                            '<div class="message message-from"><div class="message-name"><h1>Arthur</h1></div><div class="message-body"><p>Street art bicycle rights letterpress mixtape cold-pressed. Drinking vinegar flexitarian quinoa twee.</p></div><div class="message-timestamp"><p>Today ' + h + ' : ' + m + '</p></div>'   
                        );
                        break;
                    case 6:
                        $('#message-feed').append(
                            '<div class="message message-from"><div class="message-name"><h1>Arthur</h1></div><div class="message-body"><p> Artisan heirloom iPhone normcore, salvia farm-to-table vice freegan hammock waistcoat.</p></div><div class="message-timestamp"><p>Today ' + h + ' : ' + m + '</p></div>'   
                        );
                        break;
                    case 7:
                        $('#message-feed').append(
                            '<div class="message message-from"><div class="message-name"><h1>Arthur</h1></div><div class="message-body"><p>Pinterest kale chips single-origin coffee, man braid franzen ethical chia plaid locavore small batch hashtag swag. Dreamcatcher kogi fingerstache, lo-fi roof party pork belly.</p></div><div class="message-timestamp"><p>Today ' + h + ' : ' + m + '</p></div>'   
                        );
                        break;
                    case 8:
                        $('#message-feed').append(
                            '<div class="message message-from"><div class="message-name"><h1>Arthur</h1></div><div class="message-body"><p> Vegan celiac heirloom knausgaard. Paleo mixtape ramps irony lomo.</p></div><div class="message-timestamp"><p>Today ' + h + ' : ' + m + '</p></div>'   
                        );
                        break;
                }
                messageFeed.scrollTop = messageFeed.scrollHeight;
            }, 2500);
        };
        
        
        //fire on enter
        
        
        if (event.keyCode == 13) {
            event.preventDefault();
            messageInput.value= "";
            appendMessage();
            messageFeed.scrollTop = messageFeed.scrollHeight;
            timedResponse();
        }        
        
    };
        
    document.addEventListener("keypress", logMessage, false);

    
}
!
999px

Console