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HTML

              
                <div class="floating-chat">
    <i class="fa fa-comments" aria-hidden="true"></i>
    <div class="chat">
        <div class="header">
            <span class="title">
                what's on your mind?
            </span>
            <button>
                <i class="fa fa-times" aria-hidden="true"></i>
            </button>
                         
        </div>
        <ul class="messages">
            <li class="other">asdasdasasdasdasasdasdasasdasdasasdasdasasdasdasasdasdas</li>
            <li class="other">Are we dogs??? 🐶</li>
            <li class="self">no... we're human</li>
            <li class="other">are you sure???</li>
            <li class="self">yes.... -___-</li>
            <li class="other">if we're not dogs.... we might be monkeys 🐵</li>
            <li class="self">i hate you</li>
            <li class="other">don't be so negative! here's a banana 🍌</li>
            <li class="self">......... -___-</li>
        </ul>
        <div class="footer">
            <div class="text-box" contenteditable="true" disabled="true"></div>
            <button id="sendMessage">send</button>
        </div>
    </div>
</div>
              
            
!

CSS

              
                // Imports
// --------------------------------------
@import 'https://fonts.googleapis.com/css?family=Noto+Sans';
// Variables
// --------------------------------------
$scrollbar-width: 5px;
$chat-thread-bgd-color: rgba(25, 147, 147, 0.2);
$chat-thread-msg-arrow-size: 10px;
$chat-thread-avatar-size: 25px;
$chat-thread-offset: #{$chat-thread-avatar-size + 20px};
$default-shadow-color: rgb(0, 0, 0);
// Mixins
// --------------------------------------
@mixin fancy-background() {
    background: -moz-linear-gradient(-45deg, #183850 0, #183850 25%, #192C46 50%, #22254C 75%, #22254C 100%);
    background: -webkit-linear-gradient(-45deg, #183850 0, #183850 25%, #192C46 50%, #22254C 75%, #22254C 100%);
    background-repeat: no-repeat;
    background-attachment: fixed;
}

@mixin fancy-scrollbar() {
    &::-webkit-scrollbar {
        width: $scrollbar-width;
    }
    &::-webkit-scrollbar-track {
        border-radius: $scrollbar-width;
        background-color: rgba(25, 147, 147, 0.1);
    }
    &::-webkit-scrollbar-thumb {
        border-radius: $scrollbar-width;
        background-color: $chat-thread-bgd-color;
    }
}

@mixin scrolling-shadows($background-color: transparent, $shadow-intensity: 0.5, $shadow-color: $default-shadow-color, $cover-size: 40px, $shadow-size: 14px) {
    // Shadow covers
    background: linear-gradient($background-color 30%, rgba($background-color, 0)), linear-gradient(rgba($background-color, 0), $background-color 70%) 0 100%, radial-gradient(50% 0, farthest-side, rgba($shadow-color, $shadow-intensity), rgba($shadow-color, 0)), radial-gradient(50% 100%, farthest-side, rgba($shadow-color, $shadow-intensity), rgba($shadow-color, 0)) 0 100%;
    background: linear-gradient($background-color 30%, rgba($background-color, 0)), linear-gradient(rgba($background-color, 0), $background-color 70%) 0 100%, radial-gradient(farthest-side at 50% 0, rgba($shadow-color, $shadow-intensity), rgba($shadow-color, 0));
    // also add button shadow:
    //radial-gradient(farthest-side at 50% 100%, rgba($shadow-color,$shadow-intensity), rgba($shadow-color,0)) 0 100%;
    background-repeat: no-repeat;
    background-color: $background-color;
    background-size: 100% $cover-size, 100% $cover-size, 100% $shadow-size, 100% $shadow-size;
    // Opera doesn't support this in the shorthand
    background-attachment: local, local, scroll, scroll;
}

* {
    box-sizing: border-box;
}

body {
    background: skyblue;
    font: 12px/16px 'Noto Sans', sans-serif;
}

.floating-chat {
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    position: fixed;
    bottom: 10px;
    right: 10px;
    width: 40px;
    height: 40px;
    transform: translateY(70px);
    transition: all 250ms ease-out;
    border-radius: 50%;
    opacity: 0;
    @include fancy-background;
    &.enter:hover {
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23);
        opacity: 1;
    }
    &.enter {
        transform: translateY(0);
        opacity: 0.6;
        box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.12), 0px 1px 2px rgba(0, 0, 0, 0.14);
    }
    &.expand {
        width: 250px;
        max-height: 400px;
        height: 400px;
        border-radius: 5px;
        cursor: auto;
        opacity: 1;
    }
    :focus {
        outline: 0;
        box-shadow: 0 0 3pt 2pt rgba(#0EC879, 0.3);
    }
    button {
        background: transparent;
        border: 0;
        color: white;
        text-transform: uppercase;
        border-radius: 3px;
        cursor: pointer;
    }
    .chat {
        display: flex;
        flex-direction: column;
        position: absolute;
        opacity: 0;
        width: 1px;
        height: 1px;
        border-radius: 50%;
        transition: all 250ms ease-out;
        margin: auto;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        &.enter {
            opacity: 1;
            border-radius: 0;
            margin: 10px;
            width: auto;
            height: auto;
        }
        .header {
            flex-shrink: 0;
            padding-bottom: 10px;
            display: flex;
            background: transparent;
            .title {
                flex-grow: 1;
                flex-shrink: 1;
                padding: 0 5px;
            }
            button {
                flex-shrink: 0;
            }
        }
        .messages {
            padding: 10px;
            margin: 0;
            list-style: none;
            overflow-y: scroll;
            overflow-x: hidden;
            flex-grow: 1;
            border-radius: 4px;
            background: transparent;
            @include fancy-scrollbar;
            li {
                position: relative;
                clear: both;
                display: inline-block;
                padding: 14px;
                margin: 0 0 20px 0;
                font: 12px/16px 'Noto Sans', sans-serif;
                border-radius: 10px;
                background-color: $chat-thread-bgd-color;
                word-wrap: break-word;
                max-width: 81%;
                &:before {
                    position: absolute;
                    top: 0;
                    width: $chat-thread-avatar-size;
                    height: $chat-thread-avatar-size;
                    border-radius: $chat-thread-avatar-size;
                    content: '';
                    background-size: cover;
                }
                &:after {
                    position: absolute;
                    top: $chat-thread-msg-arrow-size;
                    content: '';
                    width: 0;
                    height: 0;
                    border-top: $chat-thread-msg-arrow-size solid $chat-thread-bgd-color;
                }
            }
            li.other {
                animation: show-chat-odd 0.15s 1 ease-in;
                -moz-animation: show-chat-odd 0.15s 1 ease-in;
                -webkit-animation: show-chat-odd 0.15s 1 ease-in;
                float: right;
                margin-right: $chat-thread-offset;
                color: #0AD5C1;
            }
            li.other:before {
                right: -$chat-thread-offset;
                // Placeholder avatar 1
                background-image: url(https://github.com/Thatkookooguy.png);
            }
            li.other:after {
                border-right: $chat-thread-msg-arrow-size solid transparent;
                right: -$chat-thread-msg-arrow-size;
            }
            li.self {
                animation: show-chat-even 0.15s 1 ease-in;
                -moz-animation: show-chat-even 0.15s 1 ease-in;
                -webkit-animation: show-chat-even 0.15s 1 ease-in;
                float: left;
                margin-left: $chat-thread-offset;
                color: #0EC879;
            }
            li.self:before {
                left: -$chat-thread-offset;
                // Placeholder avatar 2
                background-image: url(https://github.com/ortichon.png);
            }
            li.self:after {
                border-left: $chat-thread-msg-arrow-size solid transparent;
                left: -$chat-thread-msg-arrow-size;
            }
        }
        .footer {
            flex-shrink: 0;
            display: flex;
            //flex-direction: row-reverse;
            padding-top: 10px;
            max-height: 90px;
            background: transparent;
            .text-box {
                border-radius: 3px;
                background: $chat-thread-bgd-color;
                min-height: 100%;
                width: 100%;
                margin-right: 5px;
                color: #0EC879;
                overflow-y: auto;
                padding: 2px 5px;
                @include fancy-scrollbar;
            }
        }
    }
}

// Animation
// --------------------------------------
@keyframes show-chat-even {
    0% {
        margin-left: -480px;
    }
    100% {
        margin-left: 0;
    }
}

@-moz-keyframes show-chat-even {
    0% {
        margin-left: -480px;
    }
    100% {
        margin-left: 0;
    }
}

@-webkit-keyframes show-chat-even {
    0% {
        margin-left: -480px;
    }
    100% {
        margin-left: 0;
    }
}

@keyframes show-chat-odd {
    0% {
        margin-right: -480px;
    }
    100% {
        margin-right: 0;
    }
}

@-moz-keyframes show-chat-odd {
    0% {
        margin-right: -480px;
    }
    100% {
        margin-right: 0;
    }
}

@-webkit-keyframes show-chat-odd {
    0% {
        margin-right: -480px;
    }
    100% {
        margin-right: 0;
    }
}
              
            
!

JS

              
                var element = $('.floating-chat');
var myStorage = localStorage;

if (!myStorage.getItem('chatID')) {
    myStorage.setItem('chatID', createUUID());
}

setTimeout(function() {
    element.addClass('enter');
}, 1000);

element.click(openElement);

function openElement() {
    var messages = element.find('.messages');
    var textInput = element.find('.text-box');
    element.find('>i').hide();
    element.addClass('expand');
    element.find('.chat').addClass('enter');
    var strLength = textInput.val().length * 2;
    textInput.keydown(onMetaAndEnter).prop("disabled", false).focus();
    element.off('click', openElement);
    element.find('.header button').click(closeElement);
    element.find('#sendMessage').click(sendNewMessage);
    messages.scrollTop(messages.prop("scrollHeight"));
}

function closeElement() {
    element.find('.chat').removeClass('enter').hide();
    element.find('>i').show();
    element.removeClass('expand');
    element.find('.header button').off('click', closeElement);
    element.find('#sendMessage').off('click', sendNewMessage);
    element.find('.text-box').off('keydown', onMetaAndEnter).prop("disabled", true).blur();
    setTimeout(function() {
        element.find('.chat').removeClass('enter').show()
        element.click(openElement);
    }, 500);
}

function createUUID() {
    // http://www.ietf.org/rfc/rfc4122.txt
    var s = [];
    var hexDigits = "0123456789abcdef";
    for (var i = 0; i < 36; i++) {
        s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
    }
    s[14] = "4"; // bits 12-15 of the time_hi_and_version field to 0010
    s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01
    s[8] = s[13] = s[18] = s[23] = "-";

    var uuid = s.join("");
    return uuid;
}

function sendNewMessage() {
    var userInput = $('.text-box');
    var newMessage = userInput.html().replace(/\<div\>|\<br.*?\>/ig, '\n').replace(/\<\/div\>/g, '').trim().replace(/\n/g, '<br>');

    if (!newMessage) return;

    var messagesContainer = $('.messages');

    messagesContainer.append([
        '<li class="self">',
        newMessage,
        '</li>'
    ].join(''));

    // clean out old message
    userInput.html('');
    // focus on input
    userInput.focus();

    messagesContainer.finish().animate({
        scrollTop: messagesContainer.prop("scrollHeight")
    }, 250);
}

function onMetaAndEnter(event) {
    if ((event.metaKey || event.ctrlKey) && event.keyCode == 13) {
        sendNewMessage();
    }
}
              
            
!
999px

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