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HTML 

              
                <div id="convo" data-from="Sonu Joshi">  
<ul class="chat-thread">
	<li>Are we meeting today?</li>
	<li>yes, what time suits you?</li>
	<li>I was thinking after lunch, I have a meeting in the morning</li>
  	<li>Are we meeting today?</li>
	<li>yes, what time suits you?</li>
	<li>I was thinking after lunch, I have a meeting in the morning</li>
  	<li>Are we meeting today?</li>
	<li>yes, what time suits you?</li>
	<li>I was thinking after lunch, I have a meeting in the morning</li>
  	<li>Are we meeting today?</li>
	<li>yes, what time suits you?</li>
	<li>I was thinking after lunch, I have a meeting in the morning</li>
</ul>
</div>
<div class="credits"><a href="https://codepen.io/clintioo/pen/HAkjq">Original Pen</a> by <a href="https://codepen.io/clintioo/pen/HAkjq">clintioo</a></div>
!

CSS 

              
                @import 'https://fonts.googleapis.com/css?family=Noto+Sans';
body {
  padding: 0;
  margin: 0;
  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;
}

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  border-radius: 10px;
  background-color: rgba(25, 147, 147, 0.1);
}

::-webkit-scrollbar-thumb {
  border-radius: 10px;
  background-color: rgba(25, 147, 147, 0.2);
}

.chat-thread {
  margin: 24px auto 0 auto;
  padding: 0 20px 0 0;
  list-style: none;
  overflow-y: scroll;
  overflow-x: hidden;
}

.chat-thread li {
  position: relative;
  clear: both;
  display: inline-block;
  padding: 16px 40px 16px 20px;
  margin: 0 0 20px 0;
  font: 16px/20px 'Noto Sans', sans-serif;
  border-radius: 10px;
  background-color: rgba(25, 147, 147, 0.2);
}

/* Chat - Avatar */
.chat-thread li:before {
  position: absolute;
  top: 0;
  width: 50px;
  height: 50px;
  border-radius: 50px;
  content: '';
}

/* Chat - Speech Bubble Arrow */
.chat-thread li:after {
  position: absolute;
  top: 15px;
  content: '';
  width: 0;
  height: 0;
  border-top: 15px solid rgba(25, 147, 147, 0.2);
}

.chat-thread li:nth-child(odd) {
  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: 80px;
  color: #0AD5C1;
}

.chat-thread li:nth-child(odd):before {
  right: -80px;
  background-image: url(data:image/jpeg;base64,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);
}

.chat-thread li:nth-child(odd):after {
  border-right: 15px solid transparent;
  right: -15px;
}

.chat-thread li:nth-child(even) {
  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: 80px;
  color: #0EC879;
}

.chat-thread li:nth-child(even):before {
  left: -80px;
  background-image: url(data:image/jpeg;base64,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);
}

.chat-thread li:nth-child(even):after {
  border-left: 15px solid transparent;
  left: -15px;
}

.chat-window {
  position: fixed;
  bottom: 18px;
}

.chat-window-message {
  width: 100%;
  height: 48px;
  font: 32px/48px 'Noto Sans', sans-serif;
  background: none;
  color: #0AD5C1;
  border: 0;
  border-bottom: 1px solid rgba(25, 147, 147, 0.2);
  outline: none;
}

/* Small screens */
@media all and (max-width: 767px) {
  .chat-thread {
    width: 90%;
    height: 260px;
  }

  .chat-window {
    left: 5%;
    width: 90%;
  }
}
/* Medium and large screens */
@media all and (min-width: 768px) {
  .chat-thread {
    width: 50%;
    height: 320px;
  }

  .chat-window {
    left: 25%;
    width: 50%;
  }
}
@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;
  }
}
.credits{
  text-align:center;
  margin-top:35px;
  color: rgba(255, 255, 255, 0.35);
  font-family: 'Noto Sans', sans-serif;
}
.credits a{
  text-decoration:none;
  color: rgba(255, 255, 255, 0.35);
}
!

JS
!
999px

Console