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HTML 

              
                h1.title Material Design Chat

.wrapper
  nav#nav.nav
    .default-nav
      .main-nav
        .toggle
        .main-nav-item
          a.main-nav-item-link(href="#") Blake
        .options
  .inner#inner
    .content#content
  .bottom#bottom
    textarea.input#input
    .send#send
!

CSS 

              
                $blue: #2196F3;
$dingy: #495B6A;
$white: #ffffff;
$purple: #673AB7;
$yellow: #FFEB3B;
$red: #F44336;
$orange: #FF5722;
$black: #333333;

$nav: 100;

$navHeight: 64px;

$trans: 0.3s ease;

* {
  box-sizing: border-box;
}

body {
  /* position: relative; */
  background-color: $orange;
}

.title {
  color: $white;
  text-align: center;
  font-weight: 100;
}

.wrapper {
  height: 520px;
  width: 320px;
  overflow: hidden;
  background-color: white;
  position: fixed;
  top: 100px;
  left: 50%;
  transform: translateX(-50%);
  
  box-shadow:         0px 3px 3px 0px rgba(50, 50, 50, 0.5);
  
  .inner {
    overflow: scroll;
    height: 520px;
    padding-top: $navHeight;
    background: darken($white, 5%);
    
    -ms-overflow-style: none;
    overflow: -moz-scrollbars-none;
    //gotta hide windows scrollbars
    
    &::-webkit-scrollbar {
      width: 0 !important
    }
    
    .content {
      padding: ($navHeight - ($navHeight/1.5)) / 2;
      position: relative;
      margin-bottom: $navHeight/2;
    }
  }
  
  transition: $trans;
}

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: $navHeight;
  z-index: $nav;

  .default-nav {
    height: $navHeight;
    width: 100%;
    position: absolute;
    left: 0;
    top: 0;
    z-index: $nav + 10;

    background-color: $red;
    border-bottom: 3px solid darken($red, 10%);;
    color: $white;

    -webkit-box-shadow: 0px 3px 3px 0px rgba(50, 50, 50, 0.1);
    -moz-box-shadow:    0px 3px 3px 0px rgba(50, 50, 50, 0.1);
    box-shadow:         0px 3px 3px 0px rgba(50, 50, 50, 0.1);

    .main-nav {
      position: absolute;
      left: 0;
      width: 100%;
      height: $navHeight;
      top: 0;

      margin: 0;
      padding: 0;

      list-style: none;
      
      .toggle {
        height: 32px;
        width: 32px;
        background: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/104946/ic_arrow_back_white_48dp.png);
        background-size: contain;
        margin: 16px;
        float: left;
        
        &:hover {
          cursor: pointer;
        }
      }
      
      .options {
        height: 32px;
        width: 32px;
        background: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/104946/ic_more_vert_white_48dp.png);
        background-size: contain;
        margin: 16px;
        position: absolute;
        right: 0;
        
        &:hover {
          cursor: pointer;
        }
      }

      .main-nav-item {
        float: left;
        height: $navHeight;
        margin-right: 50px;
        position: relative;

        // text-align: center;
        line-height: $navHeight;

        .main-nav-item-link {
          display: block;
          position: relative;
          height: $navHeight;
          width: 100%;

          text-align: center;
          line-height: $navHeight;
          text-decoration: none;
          color: inherit;

          transition: $trans;
        }

        transition: $trans;
      }
      
      transition: $trans;
    }

    transition: $trans;
  }
  
  transition: $trans;
}

.bottom {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: $navHeight;
  background: $white;
  
  /* box-shadow: 0px -3px 3px 0px rgba(50, 50, 50, 0.1); */
  
  .input {
    height: $navHeight;
    background: $white;
    border: none;
    width: calc(100% - #{$navHeight});
    position: absolute;
    left: 0;
    top: 0;
    padding: 0 5%;
    resize: none;
    overflow: scroll;
    padding-top: ($navHeight/2) - 8;
    font-weight: 300;
    
    &:focus {
      outline: none;
    }
  
    -ms-overflow-style: none;
    overflow: -moz-scrollbars-none;
    //gotta hide windows scrollbars
    
    &::-webkit-scrollbar {
      width: 0 !important
    }
  }

  .send {
    position: fixed;
    height: $navHeight/1.5;
    width: $navHeight/1.5;
    border-radius: 50%;
    border: 0;
    background: $red;
    color: $white;
    
    bottom: ($navHeight - ($navHeight/1.5)) / 2;
    right: ($navHeight - ($navHeight/1.5)) / 2;
    
    &:before {
      content: '';
      background: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/104946/ic_send_white_48dp.png) no-repeat center center;
    background-size: $navHeight/2.5;
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
    }
    
    &:focus {
      outline: none;
    }
    
    &:hover {
      cursor: pointer;
    }
  }
}

.message-wrapper {
  position: relative;
  overflow: hidden;
  
  width: 100%;
  margin: (($navHeight - ($navHeight/1.5)) / 2) 0;
  padding: (($navHeight - ($navHeight/1.5)) / 2) 0;
  
  .circle-wrapper {
    height: $navHeight/1.5;
    width: $navHeight/1.5;
    border-radius: 50%;
  }
  
  .text-wrapper {
    padding: ($navHeight - ($navHeight/1.5)) / 2;
    min-height: $navHeight/1.5;
    width: 60%;
    margin: 0 ($navHeight - ($navHeight/1.5)) / 2;
    box-shadow: 0px 1px 0px 0px rgba(50, 50, 50, 0.3);
    border-radius: 2px;
    font-weight: 300;
    position: relative;
    /* word-break: break-all; */
    opacity: 0;
    
    &:before {
      content: '';
      width: 0;
      height: 0;
      border-style: solid;
    }
  }
  
  &.them {
    .circle-wrapper, .text-wrapper {
      background: $red;
      float: left;
      color: $white;
    }
    
    .text-wrapper {
      &:before {
        border-width: 0 10px 10px 0;
        border-color: transparent $red transparent transparent;
        position: absolute;
        top: 0;
        left: -9px;
      }
    }
  }
  
  &.me {
    .circle-wrapper, .text-wrapper {
      background: $orange;
      float: right;
      color: $black;
    }
    
    .text-wrapper {
      background: $white;
      
      &:before {
        border-width: 10px 10px 0 0;
        border-color: $white transparent transparent transparent;
        position: absolute;
        top: 0;
        right: -9px;
      }
    }
  }
}

@media (max-width: 560px) {
  .wrapper {
    width: 100%;
    height: 100%;
    height: 100vh;
    top: 0;
    left: 0;
    transform: translateX(0);
    
    .inner {
      height: 100%;
      height: 100vh;
    }
  }
}
!

JS 

              
                class Messenger {
  constructor() {
    this.messageList = [];
    this.deletedList = [];
    
    this.me = 1; // completely arbitrary id
    this.them = 5; // and another one
    
    this.onRecieve = (message) => console.log('Recieved: ' + message.text);
    this.onSend = (message) => console.log('Sent: ' + message.text);
    this.onDelete = (message) => console.log('Deleted: ' + message.text);
  }
  
  send(text = '') {
    text = this.filter(text);
    
    if (this.validate(text)) {
      let message = {
        user: this.me,
        text: text,
        time: new Date().getTime()
      };
      
      this.messageList.push(message);
      
      this.onSend(message);
    }
  }
  
  recieve(text = '') {
    text = this.filter(text);
    
    if (this.validate(text)) {
      let message = {
        user: this.them,
        text: text,
        time: new Date().getTime()
      };
      
      this.messageList.push(message);
      
      this.onRecieve(message);
    }
  }
  
  delete(index) {
    index = index || (this.messageLength - 1);
    
    let deleted = this.messageLength.pop();
    
    this.deletedList.push(deleted);
    this.onDelete(deleted);
  }
  
  filter(input) {
    let output = input.replace('bad input', 'good output'); // such amazing filter there right?
    return output;
  }
  
  validate(input) {
    return !!input.length; // an amazing example of validation I swear.
  }
}

class BuildHTML {
  constructor() {
    this.messageWrapper = 'message-wrapper';
    this.circleWrapper = 'circle-wrapper';
    this.textWrapper = 'text-wrapper';
    
    this.meClass = 'me';
    this.themClass = 'them';
  }
  
  _build(text, who) {
    return `<div class="${this.messageWrapper} ${this[who + 'Class']}">
              <div class="${this.circleWrapper} animated bounceIn"></div>
              <div class="${this.textWrapper}">...</div>
            </div>`;
  }
  
  me(text) {
    return this._build(text, 'me');
  }
  
  them(text) {
    return this._build(text, 'them');
  }
}

$(document).ready(function() {
  let messenger = new Messenger();
  let buildHTML = new BuildHTML();

  let $input = $('#input');
  let $send = $('#send');
  let $content = $('#content');
  let $inner = $('#inner');
  
  function safeText(text) {
    $content.find('.message-wrapper').last().find('.text-wrapper').text(text);
  }
  
  function animateText() {
    setTimeout(() => {
      $content.find('.message-wrapper').last().find('.text-wrapper').addClass('animated fadeIn');
    }, 350)
  }
  
  function scrollBottom() {
    $($inner).animate({
      scrollTop: $($content).offset().top + $($content).outerHeight(true)
    }, {
      queue: false,
      duration: 'ease'
    });
  }
  
  function buildSent(message) {
    console.log('sending: ', message.text);
    
    $content.append(buildHTML.me(message.text));
    safeText(message.text);
    animateText();
    
    scrollBottom();
  }
  
  function buildRecieved(message) {
    console.log('recieving: ', message.text);
    
    $content.append(buildHTML.them(message.text));
    safeText(message.text);
    animateText();
    
    scrollBottom();
  }
  
  function sendMessage() {
    let text = $input.val();
    messenger.send(text);
    
    $input.val('');
    $input.focus();
  }
  
  messenger.onSend = buildSent;
  messenger.onRecieve = buildRecieved;
  
  setTimeout(() => {
    messenger.recieve('Hello there!');
  }, 1500);
  
  setTimeout(() => {
    messenger.recieve('Do you like this? If so check out more on my page...');
  }, 5000);
  
  setTimeout(() => {
    messenger.recieve('Or maybe just give it a like!');
  }, 7500);
  
  $input.focus();

  $send.on('click', function(e) {
    sendMessage();
  });
  
  $input.on('keydown', function(e) {
    let key = e.which || e.keyCode;
    
    if (key === 13) { // enter key
      e.preventDefault();
      
      sendMessage();
    }
  });
});
!
999px

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