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HTML 

              
                
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <script src="https://kit.fontawesome.com/391827d54c.js" crossorigin="anonymous"></script>
  <link rel="stylesheet" href="styles.css">
  <title>Whatsapp Clone</title>

  <div class="background-green"></div>


  <div class="main-container">
    <div class="left-container">

<!--header -->
      <div class="header">
        <div class="user-img">
          <img class="dp" src="https://www.codewithfaraz.com/InstaPic.png" alt="">
        </div>
        <div class="nav-icons">
          <li><i class="fa-solid fa-users"></i></li>
          <li><i class="fa-solid fa-message">
 </i></li>
          <li><i class="fa-solid fa-ellipsis-vertical"></i></li>
        </div>
      </div>


<!--notification -->
      <div class="notif-box">
        <i class="fa-solid fa-bell-slash"></i>
        <div class="notif-text">
             <p>Get Notified of New Messages</p>
             <a href="#">Turn on Desktop Notifications ›</a>
            </div>
        <i class="fa-solid fa-xmark"></i>
      </div>

<!--search-container -->
      <div class="search-container">
        <div class="input">
<i class="fa-solid fa-magnifying-glass"></i>
          <input type="text" placeholder="Search or start new chat   "></div>
     <i class="fa-sharp fa-solid fa-bars-filter"></i>
      </div>


<!--chats -->
      <div class="chat-list">
        <div class="chat-box">
          <div class="img-box">
            <img class="img-cover" src="https://lh5.googleusercontent.com/-7ssjf_mDE1Q/AAAAAAAAAAI/AAAAAAAAASo/tioYx2oklWEHoo5nAEyCT-KeLxYqE5PuQCLcDEAE/s100-c-k-no-mo/photo.jpg" alt="">
          </div>
          <div class="chat-details">
            <div class="text-head">
              <h4>Nowfal</h4>
              <p class="time unread">11:49</p>
            </div>
            <div class="text-message">
              <p>“How are you?”</p>
              <b>1</b>
            </div>
          </div>
        </div>
        <div class="chat-box">
          <div class="img-box">
            <img class="img-cover" src="https://images.pexels.com/photos/2379005/pexels-photo-2379005.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1" alt="">
          </div>
          <div class="chat-details">
            <div class="text-head">
              <h4>Rohan</h4>
              <p class="time unread">10:49</p>
            </div>
            <div class="text-message">
              <p>“I’ll be there.”</p>
              <b>4</b>
            </div>
          </div>
        </div>
        <div class="chat-box">
          <div class="img-box">
            <img class="img-cover" src="https://images.pexels.com/photos/8367221/pexels-photo-8367221.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1" alt="">
          </div>
          <div class="chat-details">
            <div class="text-head">
              <h4>Zoya</h4>
              <p class="time unread">09:49</p>
            </div>
            <div class="text-message">
              <p>“Make somebody’s day.”</p>
              <b>2</b>
            </div>
          </div>
        </div>
        <div class="chat-box">
          <div class="img-box">
            <img class="img-cover" src="https://images.pexels.com/photos/1382731/pexels-photo-1382731.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1" alt="">
          </div>
          <div class="chat-details">
            <div class="text-head">
              <h4>Ava</h4>
              <p class="time">08:49</p>
            </div>
            <div class="text-message">
              <p>“Dreams come true.”</p>
            </div>
          </div>
        </div>
        <div class="chat-box active">
          <div class="img-box">
            <img class="img-cover" src="https://images.pexels.com/photos/2474307/pexels-photo-2474307.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1" alt="">
          </div>
          <div class="chat-details">
            <div class="text-head">
              <h4>Leo</h4>
              <p class="time">07:49</p>
            </div>
            <div class="text-message">
              <p>Awesome! I'll start a vid..</p>
            </div>
          </div>
        </div>
        <div class="chat-box">
          <div class="img-box">
            <img class="img-cover" src="https://images.pexels.com/photos/3564412/pexels-photo-3564412.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1" alt="">
          </div>
          <div class="chat-details">
            <div class="text-head">
              <h4>Azariah</h4>
              <p class="time">06:49</p>
            </div>
            <div class="text-message">
              <p>“Love, light, laughter.”</p>
            </div>
          </div>
        </div>
        <div class="chat-box">
          <div class="img-box">
            <img class="img-cover" src="https://images.pexels.com/photos/2919367/pexels-photo-2919367.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1" alt="">
          </div>
          <div class="chat-details">
            <div class="text-head">
              <h4>Oliver</h4>
              <p class="time unread">Yesterday</p>
            </div>
            <div class="text-message">
              <p>“Appreciate the mome..”</p>
              <b>2</b>
            </div>
          </div>
        </div>
        <div class="chat-box">
          <div class="img-box">
            <img class="img-cover" src="https://images.pexels.com/photos/14526673/pexels-photo-14526673.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1" alt="">
          </div>
          <div class="chat-details">
            <div class="text-head">
              <h4>Jeslin</h4>
              <p class="time">Yesterday</p>
            </div>
            <div class="text-message">
              <p>“Now or never.”</p>
            </div>
          </div>
        </div>
      </div>

    </div>





    <div class="right-container">
<!--header -->
      <div class="header">
        <div class="img-text">
          <div class="user-img">
          <img class="dp" src="https://images.pexels.com/photos/2474307/pexels-photo-2474307.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1" alt="">
        </div>
          <h4>Leo<br><span>Online</span></h4>
        </div>
        <div class="nav-icons">
          <li><i class="fa-solid fa-magnifying-glass"></i></li>
          <li><i class="fa-solid fa-ellipsis-vertical"></i></li>
        </div>
      </div>

<!--chat-container -->
      <div class="chat-container">
        <div class="message-box my-message">
          <p>I've been waiting to see that show asap!<br><span>07:43</span></p>
        </div>
        <div class="message-box friend-message">
          <p>Ahh, I can't believe you do too!<br><span>07:45</span></p>
        </div>
        <div class="message-box friend-message">
          <p>The trailer looks good<br><span>07:45</span></p>
        </div>
        <div class="message-box friend-message">
          <p>I've been waiting to watch it!!<br><span>07:45</span></p>
        </div>
        <div class="message-box my-message">
          <p>😐😐😐<br><span>07:46</span></p>
        </div>
        <div class="message-box my-message">
          <p>Mee too! 😊<br><span>07:46</span></p>
        </div>
      <div class="message-box friend-message">
          <p>We should video chat to discuss, if you're up for it!<br><span>07:48</span></p>
        </div>
        <div class="message-box my-message">
          <p>Sure<br><span>07:48</span></p>
        </div>
        <div class="message-box my-message">
          <p>I'm free now!<br><span>07:48</span></p>
        </div>
      <div class="message-box friend-message">
          <p>Awesome! I'll start a video chat with you in a few.<br><span>07:49</span></p>
        </div>
      </div>

<!--input-bottom -->
      <div class="chatbox-input">
        <i class="fa-regular fa-face-grin"></i>
        <i class="fa-sharp fa-solid fa-paperclip"></i>
        <input type="text" placeholder="Type a message">
        <i class="fa-solid fa-microphone"></i>
      </div>
    </div>

  </div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #ccc;
}

.background-green {
  position: absolute;
  top: 0;
  width: 100%;
  height: 20%;
  background-color: #009688;
}

.main-container {
  position: relative;
  width: 1000px;
  max-width: 100%;
  height: calc(100vh - 40px);
  background: #fff;
  display: flex;
  box-shadow: 0px 1px 1px  0 rgba(0,0,0,0.5), 0px 2px 5px 0 rgba(0,0,0,0.6);
}

.main-container .left-container {
  position:relative;
  width: 30%;
  height:100%;
  flex: 30%;
  background: #fff;
}

.main-container .right-container {
  position: relative;
  width: 70%;
  height: 100%;
  flex: 70%;
  background: #e5ddd5;
}

.main-container .right-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url(https://camo.githubusercontent.com/854a93c27d64274c4f8f5a0b6ec36ee1d053cfcd934eac6c63bed9eaef9764bd/68747470733a2f2f7765622e77686174736170702e636f6d2f696d672f62672d636861742d74696c652d6461726b5f61346265353132653731393562366237333364393131306234303866303735642e706e67);
  opacity: 0.5;
}

.header {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  height: 60px;
  background: #ededed;
  padding: 0 15px;
}

.user-img {
  position:relative;
  width: 40px;
  height: 40px;
  overflow: hidden;
  border-radius: 50%;
}

.dp {
  position:absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  cursor: pointer;
}

.nav-icons {
  display:flex;
  justify-content: flex-end;
  padding-left: 110px;
}

.nav-icons li {
  backgroud-color:pink;
  list-style: none;
  display: flex;
  cursor: pointer;
  color: #51585c;
  margin-left: 22px;
  font-size: 18px;
}

.notif-box {
  position: relative;
  display: flex;
  width: 100%;
  height: 70px;
  background: #76daff;
  align-items: center;
  font-size: 0.8em;
  text-decoration: none;
}

.notif-box i {
  position:relative;
  left: 13px;
  background:#fff;
  padding:10px;
  width: 42px;
  height: auto;
  font-size: 20px;
  border-radius: 55%;
  cursor: pointer;
  color:#76daff;
}

.notif-box .fa-xmark {
  position: absolute;
  left: 260px;
  text-align:center;
  background:#76daff;
  color: #fff;
}

.notif-text {
  margin: 25px;
}

.notif-text a {
  text-decoration: none;
  color: #333;
  font-size: 0.9em;
}

.search-container {
  position:relative;
  width: 100%;
  height: 40px;
  background: #f6f6f6;
  display: flex;
/*   justify-content: center; */
  align-items: center;
}

.search-container .input input {
  width: 121%;
  outline: none;
  border: none;
  background: #fff;
  padding: 5px;
  height: 30x;
  border-radius: 10px;
  font-size: 12px;
  padding-left: 60px;
  margin: 10px
}

.search-container .input i {
  position: absolute;
  left: 26px;
  top: 14px;
  color:#bbb;
  font-size: 0.8em;
}

.chat-list {
  position: relative;
  height:calc(100% - 170px);
  overflow-y: auto;
}

.chat-list .chat-box {
  position: relative;
  width: 100%;
  display:flex;
/*   justify-content: center; */
  align-items:center;
  cursor: pointer;
  padding: 15px;
  border-bottom: 1px solid #eee;
}

.chat-list .chat-box .img-box {
  position:relative;
  width: 55px;
  height:45px;
  overflow:hidden;
  border-radius: 50%;
}

.chat-list .chat-box .chat-details {
  width: 100%;
  margin-left: 10px;
}

.chat-list .chat-box .chat-details .text-head {
  display:flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom:2px;
}

.chat-list .chat-box .chat-details .text-head h4 {
  font-size: 1.1em;
  font-weight: 600;
  color: #000;
}

.chat-list .chat-box .chat-details .text-head .time {
  font-size: 0.8em;
  color: #aaa;
}

.chat-list .chat-box .chat-details .text-message {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-list .chat-box .chat-details .text-message p {
  color: #aaa;
  font-size: 0.9em;
  overlay: hidden;
}

img {
  width: 100%;
  object-fit: cover;
}

.chat-list .chat-box .chat-details .text-message b {
  background: #06e744;
  color: #fff;
  min-width: 20px;
  height: 20px;
  border-radius: 50%;
/*   text-align: center; */
  font-size: 0.8em;
  font-weight: 400;
  display:flex;
  justify-content:center;
  align-items:center;
}

.chat-list .active {
  background: #ebebeb;
}

.chat-list .chat-box:hover {
  background: #f5f5f5;
}

.chat-list .chat-box .chat-details .text-head .unread {
  color: #06e744;
}


/* right-container */


.right-container .header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.right-container .header .img-text .user-img .dp {
  position:relative;
  top: -2px;
  left: 0px;
  width: 40px;
  height:auto;
  overflow:hidden;
  object-fit: cover;
}

.right-container .header .img-text {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}

.right-container .header .img-text h4 {
  font-weight: 500;
  line-height: 1.2em;
  margin-left: 15px;
}

.right-container .header .img-text h4 span {
  font-size: 0.8em;
  color: #555;
}

.right-container .header .nav-icons {
  position: relative;
  margin-right:0px;
/*   padding: 5px; */
}

.right-container .header .nav-icons i {
  padding: 10px;
}

.chat-container {
  position:relative;
  width: 100%;
  height: calc(100% - 120px);  /*60+60*/
  padding: 50px;
  overflow-y: auto;
}

.message-box {
  position:relative;
  display: flex;
  width:100%;
  margin: 5px 0;
}

.message-box p {
  position:relative;
  right: 0;
  text-align: right;
  max-width: 65%;
  padding: 12px;
  background: #dcf8c6;
  border-radius: 10px;
  font-size: 0.9em;
}

.message-box.my-message p::before {
  content : '';
  position: absolute;
  top: 0;
  right: -12px;
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, #dcf8c6 0%, #dcf8c6 50%, transparent 50%, transparent);
}

.message-box p span {
  display: block;
  margin-top: 5px;
  font-size: 0.8em;
  opacity: 0.5;
}

.my-message {
  justify-content: flex-end;
}

.friend-message p {
  background: #fff;
}

.friend-message {
  justify-content: flex-start;

}

.chat-container .my-message i {
  color: yellow;
}

.message-box.friend-message::before {
  content : '';
  position: absolute;
  top: 0;
  left: -12px;
  width: 20px;
  height: 20px;
  background: linear-gradient(225deg, #fff 0%, #fff 50%, transparent 50%, transparent);
}

.chatbox-input {
  position:relative;
  width: 100%;
  height: 60px;
  background: #f0f0f0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chatbox-input i {
  cursor: pointer;
  font-size: 1.8em;
  color: #515855;
}

.chatbox-input i:nth-child(1) {
   margin: 15px;
}

.chatbox-input i:last-child {
  margin-right: 25px;
}

 .chatbox-input input {
    position: relative;
    width: 90%;
    margin: 0 20px;
    padding: 10px 20px;
    border-radius:10px;
    font-size: 1em;
    border:none;
    outline:none;
 }
!

JS
!
999px

Console