CodePen Embed - WhatsApp Inspired Bootstrap Chat UI Direct Messaging App

<div class="container">
	<div class="row no-gutters">
	  <div class="col-md-4 border-right">
		<div class="settings-tray">
		  <img class="profile-image" src="https://www.clarity-enhanced.net/wp-content/uploads/2020/06/filip.jpg" alt="Profile img">
		  <span class="settings-tray--right">
			<i class="material-icons">cached</i>
			<i class="material-icons">message</i>
			<i class="material-icons">menu</i>
		  </span>
		</div>
		<div class="search-box">
		  <div class="input-wrapper">
			<i class="material-icons">search</i>
			<input placeholder="Search here" type="text">
		  </div>
		</div>
		<div class="friend-drawer friend-drawer--onhover">
		  <img class="profile-image" src="https://www.clarity-enhanced.net/wp-content/uploads/2020/06/robocop.jpg" alt="">
		  <div class="text">
			<h6>Robo Cop</h6>
			<p class="text-muted">Hey, you're arrested!</p>
		  </div>
		  <span class="time text-muted small">13:21</span>
		</div>
		<hr>
		<div class="friend-drawer friend-drawer--onhover">
		  <img class="profile-image" src="https://www.clarity-enhanced.net/wp-content/uploads/2020/06/optimus-prime.jpeg" alt="">
		  <div class="text">
			<h6>Optimus</h6>
			<p class="text-muted">Wanna grab a beer?</p>
		  </div>
		  <span class="time text-muted small">00:32</span>
		</div>
		<hr>
		<div class="friend-drawer friend-drawer--onhover ">
		  <img class="profile-image" src="https://www.clarity-enhanced.net/wp-content/uploads/2020/06/real-terminator.png" alt="">
		  <div class="text">
			<h6>Skynet</h6>
			<p class="text-muted">Seen that canned piece of s?</p>
		  </div>
		  <span class="time text-muted small">13:21</span>
		</div>
		<hr>
		<div class="friend-drawer friend-drawer--onhover">
		  <img class="profile-image" src="https://www.clarity-enhanced.net/wp-content/uploads/2020/06/termy.jpg" alt="">
		  <div class="text">
			<h6>Termy</h6>
			<p class="text-muted">Im studying spanish...</p>
		  </div>
		  <span class="time text-muted small">13:21</span>
		</div>
		<hr>
		<div class="friend-drawer friend-drawer--onhover">
		  <img class="profile-image" src="https://www.clarity-enhanced.net/wp-content/uploads/2020/06/rick.jpg" alt="">
		  <div class="text">
			<h6>Richard</h6>
			<p class="text-muted">I'm not sure...</p>
		  </div>
		  <span class="time text-muted small">13:21</span>
		</div>
		<hr>
		<div class="friend-drawer friend-drawer--onhover">
		  <img class="profile-image" src="https://www.clarity-enhanced.net/wp-content/uploads/2020/06/rachel.jpeg" alt="">
		  <div class="text">
			<h6>XXXXX</h6>
			<p class="text-muted">Hi, wanna see something?</p>
		  </div>
		  <span class="time text-muted small">13:21</span>
		</div>
	  </div>
	  <div class="col-md-8">
		<div class="settings-tray">
			<div class="friend-drawer no-gutters friend-drawer--grey">
			<img class="profile-image" src="https://www.clarity-enhanced.net/wp-content/uploads/2020/06/robocop.jpg" alt="">
			<div class="text">
			  <h6>Robo Cop</h6>
			  <p class="text-muted">Layin' down the law since like before Christ...</p>
			</div>
			<span class="settings-tray--right">
			  <i class="material-icons">cached</i>
			  <i class="material-icons">message</i>
			  <i class="material-icons">menu</i>
			</span>
		  </div>
		</div>
		<div class="chat-panel">
		  <div class="row no-gutters">
			<div class="col-md-3">
			  <div class="chat-bubble chat-bubble--left">
				Hello dude!
			  </div>
			</div>
		  </div>
		  <div class="row no-gutters">
			<div class="col-md-3 offset-md-9">
			  <div class="chat-bubble chat-bubble--right">
				Hello dude!
			  </div>
			</div>
		  </div>
		  <div class="row no-gutters">
			<div class="col-md-3 offset-md-9">
			  <div class="chat-bubble chat-bubble--right">
				Hello dude!
			  </div>
			</div>
		  </div>
		  <div class="row no-gutters">
			<div class="col-md-3">
			  <div class="chat-bubble chat-bubble--left">
				Hello dude!
			  </div>
			</div>
		  </div>
		  <div class="row no-gutters">
			<div class="col-md-3">
			  <div class="chat-bubble chat-bubble--left">
				Hello dude!
			  </div>
			</div>
		  </div>
		  <div class="row no-gutters">
			<div class="col-md-3">
			  <div class="chat-bubble chat-bubble--left">
				Hello dude!
			  </div>
			</div>
		  </div>
		  <div class="row no-gutters">
			<div class="col-md-3 offset-md-9">
			  <div class="chat-bubble chat-bubble--right">
				Hello dude!
			  </div>
			</div>
		  </div>
		  <div class="row">
			<div class="col-12">
			  <div class="chat-box-tray">
				<i class="material-icons">sentiment_very_satisfied</i>
				<input type="text" placeholder="Type your message here...">
				<i class="material-icons">mic</i>
				<i class="material-icons">send</i>
			  </div>
			</div>
		  </div>
		</div>
	  </div>
	</div>
  </div>

// Video tutorial/codealong here: https://youtu.be/fCpw5i_2IYU
//Github: https://github.com/FilipRastovic/whatsapp-chat-app-ui
$blue: #74b9ff;

body {
  //background-image: url('https://images.unsplash.com/photo-1560568082-c15188aa6510?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=3300&q=80');
  background-color: #3498db;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

.container {
  margin: 60px auto;
  background: #fff;
  padding: 0;
  border-radius: 7px;
}

.profile-image {
  width: 50px;
  height: 50px;
  border-radius: 40px;
}

.settings-tray {
  background: #eee;
  padding: 10px 15px;
  border-radius: 7px;
  
  .no-gutters {
    padding: 0;
  }
  
  &--right {
    float: right;
    
    i {
      margin-top: 10px;
      font-size: 25px;
      color: grey;
      margin-left: 14px;
      transition: .3s;
      
      &:hover {
        color: $blue;
        cursor: pointer;
      }
    }
  }
}

.search-box {
  background: #fafafa;
  padding: 10px 13px;
  
  .input-wrapper {
    background: #fff;
    border-radius: 40px;
    
    i {
      color: grey;
      margin-left: 7px; 
      vertical-align: middle;
    }
  }
}

input {
  border: none;
  border-radius: 30px;
  width: 80%;

  &::placeholder {
    color: #e3e3e3;
    font-weight: 300;
    margin-left: 20px;
  }

  &:focus {
    outline: none;
  }
}

.friend-drawer {
  padding: 10px 15px;
  display: flex;
  vertical-align: baseline;
  background: #fff;
  transition: .3s ease;
  
  &--grey {
    background: #eee;
  }
  
  .text {
    margin-left: 12px;
    width: 70%;
    
    h6 {
      margin-top: 6px;
      margin-bottom: 0;
    }
    
    p {
      margin: 0;
    }
  }
  
  .time {
    color: grey;
  }
  
  &--onhover:hover {
    background: $blue;
    cursor: pointer;
    
    p,
    h6,
    .time {
      color: #fff !important;
    }
  }
}

hr {
  margin: 5px auto;
  width: 60%;
}

.chat-bubble {
  padding: 10px 14px;
  background: #eee;
  margin: 10px 30px;
  border-radius: 9px;
  position: relative;
  animation: fadeIn 1s ease-in;
  
  &:after {
    content: '';
    position: absolute;
    top: 50%;
    width: 0;
    height: 0;
    border: 20px solid transparent;
    border-bottom: 0;
    margin-top: -10px;
  }
  
  &--left {
     &:after {
      left: 0;
      border-right-color: #eee;
	    border-left: 0;
      margin-left: -20px;
    }
  }
  
  &--right {
    &:after {
      right: 0;
      border-left-color: $blue;
	    border-right: 0;
      margin-right: -20px;
    }
  }
}

@keyframes fadeIn {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}


.offset-md-9 {
  .chat-bubble {
    background: $blue;
    color: #fff;
  }
}

.chat-box-tray {
  background: #eee;
  display: flex;
  align-items: baseline;
  padding: 10px 15px;
  align-items: center;
  margin-top: 19px;
  bottom: 0;
  
  input {
    margin: 0 10px;
    padding: 6px 2px;
  }
  
  i {
    color: grey;
    font-size: 30px;
    vertical-align: middle;
    
    &:last-of-type {
      margin-left: 25px;
    }
  }
}

View Compiled

// Video tutorial/codealong here: https://youtu.be/fCpw5i_2IYU
//Github: https://github.com/FilipRastovic/whatsapp-chat-app-ui
$( '.friend-drawer--onhover' ).on( 'click',  function() {
  
  $( '.chat-bubble' ).hide('slow').show('slow');
  
});

// Video tutorial/codealong here: https://youtu.be/fCpw5i_2IYU

This Pen is owned by Filipo on CodePen.

See more by @FilipRastovic on CodePen

External CSS

External JavaScript

https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js