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HTML

              
                <link href="https://fonts.googleapis.com/css?family=DM+Sans:400,500,700&display=swap" rel="stylesheet"> 
<div class="app-container">
   <button class="mode-switch">
       <svg class="sun" fill="none" stroke="#fbb046" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" class="feather feather-sun" viewBox="0 0 24 24"><defs/><circle cx="12" cy="12" r="5"/><path d="M12 1v2M12 21v2M4.22 4.22l1.42 1.42M18.36 18.36l1.42 1.42M1 12h2M21 12h2M4.22 19.78l1.42-1.42M18.36 5.64l1.42-1.42"/></svg>
  <svg class="moon" fill="none" stroke="#ffffff" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" class="feather feather-moon" viewBox="0 0 24 24"><defs/><path d="M21 12.79A9 9 0 1111.21 3 7 7 0 0021 12.79z"/></svg>
     </button>
   <div class="left-side">
     <div class="navigation">
       <a href="#" class="nav-link icon">
         <svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-home" viewBox="0 0 24 24">
           <path d="M3 9l9-7 9 7v11a2 2 0 01-2 2H5a2 2 0 01-2-2z"/>
           <path d="M9 22V12h6v10"/>
         </svg>
       </a>
       <a href="#" class="nav-link icon">
         <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-message-square">
           <path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"/>
         </svg>
       </a>
       <a href="#" class="nav-link icon">
         <svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-phone-call" viewBox="0 0 24 24">
           <path d="M15.05 5A5 5 0 0119 8.95M15.05 1A9 9 0 0123 8.94m-1 7.98v3a2 2 0 01-2.18 2 19.79 19.79 0 01-8.63-3.07 19.5 19.5 0 01-6-6 19.79 19.79 0 01-3.07-8.67A2 2 0 014.11 2h3a2 2 0 012 1.72 12.84 12.84 0 00.7 2.81 2 2 0 01-.45 2.11L8.09 9.91a16 16 0 006 6l1.27-1.27a2 2 0 012.11-.45 12.84 12.84 0 002.81.7A2 2 0 0122 16.92z"/>
         </svg>
       </a>
       <a href="#" class="nav-link icon">
         <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-hard-drive">
           <line x1="22" y1="12" x2="2" y2="12"/>
           <path d="M5.45 5.11L2 12v6a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2v-6l-3.45-6.89A2 2 0 0 0 16.76 4H7.24a2 2 0 0 0-1.79 1.11z"/>
           <line x1="6" y1="16" x2="6.01" y2="16"/>
           <line x1="10" y1="16" x2="10.01" y2="16"/>
         </svg>
       </a>
       <a href="#" class="nav-link icon">
         <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-users">
           <path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"/>
           <circle cx="9" cy="7" r="4"/>
           <path d="M23 21v-2a4 4 0 0 0-3-3.87"/>
           <path d="M16 3.13a4 4 0 0 1 0 7.75"/>
         </svg>
       </a>
        <a href="#" class="nav-link icon">
          <svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-folder" viewBox="0 0 24 24">
            <path d="M22 19a2 2 0 01-2 2H4a2 2 0 01-2-2V5a2 2 0 012-2h5l2 3h9a2 2 0 012 2z"/>
          </svg>
       </a>
       <a href="#" class="nav-link icon">
         <svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-settings" viewBox="0 0 24 24">
           <circle cx="12" cy="12" r="3"/>
           <path d="M19.4 15a1.65 1.65 0 00.33 1.82l.06.06a2 2 0 010 2.83 2 2 0 01-2.83 0l-.06-.06a1.65 1.65 0 00-1.82-.33 1.65 1.65 0 00-1 1.51V21a2 2 0 01-2 2 2 2 0 01-2-2v-.09A1.65 1.65 0 009 19.4a1.65 1.65 0 00-1.82.33l-.06.06a2 2 0 01-2.83 0 2 2 0 010-2.83l.06-.06a1.65 1.65 0 00.33-1.82 1.65 1.65 0 00-1.51-1H3a2 2 0 01-2-2 2 2 0 012-2h.09A1.65 1.65 0 004.6 9a1.65 1.65 0 00-.33-1.82l-.06-.06a2 2 0 010-2.83 2 2 0 012.83 0l.06.06a1.65 1.65 0 001.82.33H9a1.65 1.65 0 001-1.51V3a2 2 0 012-2 2 2 0 012 2v.09a1.65 1.65 0 001 1.51 1.65 1.65 0 001.82-.33l.06-.06a2 2 0 012.83 0 2 2 0 010 2.83l-.06.06a1.65 1.65 0 00-.33 1.82V9a1.65 1.65 0 001.51 1H21a2 2 0 012 2 2 2 0 01-2 2h-.09a1.65 1.65 0 00-1.51 1z"/>
         </svg>
       </a>
     </div>
   </div>
   <div class="app-main">
     <div class="video-call-wrapper">
       <div class="video-participant">
         <div class="participant-actions">
           <button class="btn-mute"></button>
          <button class="btn-camera"></button>
         </div>
         <a href="#" class="name-tag">Andy Will</a>
         <img src="https://images.unsplash.com/photo-1566821582776-92b13ab46bb4?ixlib=rb-1.2.1&auto=format&fit=crop&w=900&q=60" alt="participant">
       </div>
       <div class="video-participant">
         <div class="participant-actions">
           <button class="btn-mute"></button>
          <button class="btn-camera"></button>
         </div>
         <a href="#" class="name-tag">Emmy Lou</a>
         <img src="https://images.unsplash.com/photo-1500917293891-ef795e70e1f6?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1650&q=80" alt="participant">
       </div>
       <div class="video-participant">
         <div class="participant-actions">
           <button class="btn-mute"></button>
          <button class="btn-camera"></button>
         </div>
         <a href="#" class="name-tag">Tim Russel</a>
         <img src="https://images.unsplash.com/photo-1576110397661-64a019d88a98?ixlib=rb-1.2.1&auto=format&fit=crop&w=1234&q=80" alt="participant">
       </div>
       <div class="video-participant">
         <div class="participant-actions">
           <button class="btn-mute"></button>
          <button class="btn-camera"></button>
         </div>
         <a href="#" class="name-tag">Jessica Bell</a>
         <img src="https://images.unsplash.com/photo-1600207438283-a5de6d9df13e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1234&q=80" alt="participant">
       </div>
       <div class="video-participant">
         <div class="participant-actions">
           <button class="btn-mute"></button>
          <button class="btn-camera"></button>
         </div>
         <a href="#" class="name-tag">Ryan Patrick</a>
         <img src="https://images.unsplash.com/photo-1581824283135-0666cf353f35?ixlib=rb-1.2.1&auto=format&fit=crop&w=1276&q=80" alt="participant">
       </div>
       <div class="video-participant">
         <div class="participant-actions">
           <button class="btn-mute"></button>
          <button class="btn-camera"></button>
         </div>
         <a href="#" class="name-tag">Tina Cate</a>
         <img src="https://images.unsplash.com/photo-1542596594-649edbc13630?ixlib=rb-1.2.1&auto=format&fit=crop&w=1234&q=80" alt="participant">
       </div>
     </div>
     <div class="video-call-actions ">
       <button class="video-action-button mic"></button>
       <button class="video-action-button camera"></button>
       <button class="video-action-button maximize"></button>
       <button class="video-action-button endcall">Leave</button>
       <button class="video-action-button magnifier">
         <svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-zoom-in" viewBox="0 0 24 24">
           <circle cx="11" cy="11" r="8"/>
           <path d="M21 21l-4.35-4.35M11 8v6M8 11h6"/>
         </svg>
         <span>100%</span>
           <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-zoom-out">
             <circle cx="11" cy="11" r="8"/>
             <line x1="21" y1="21" x2="16.65" y2="16.65"/>
             <line x1="8" y1="11" x2="14" y2="11"/>
         </svg>
         </button>
     </div>
   </div>
  <div class="right-side">
    <button class="btn-close-right">
      <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" class="feather feather-x-circle" viewBox="0 0 24 24">
        <defs></defs>
        <circle cx="12" cy="12" r="10"></circle>
        <path d="M15 9l-6 6M9 9l6 6"></path>
      </svg>
    </button>
    <div class="chat-container">
      <div class="chat-header">
        <button class="chat-header-button">
         Live Chat
        </button>
      </div>
      <div class="chat-area">
         <div class="message-wrapper">
          <div class="profile-picture">
            <img src="https://images.unsplash.com/photo-1581824283135-0666cf353f35?ixlib=rb-1.2.1&auto=format&fit=crop&w=1276&q=80" alt="pp">
          </div>
          <div class="message-content">
            <p class="name">Ryan Patrick</p>
            <div class="message">Helloo team!😍</div>
          </div>
        </div>
         <div class="message-wrapper">
          <div class="profile-picture">
            <img src="https://images.unsplash.com/photo-1566821582776-92b13ab46bb4?ixlib=rb-1.2.1&auto=format&fit=crop&w=900&q=60" alt="pp">
          </div>
          <div class="message-content">
            <p class="name">Andy Will</p>
            <div class="message">Hello! Can you hear me?🤯 <a class="mention">@ryanpatrick</a></div>
          </div>
        </div>
        <div class="message-wrapper">
          <div class="profile-picture">
            <img src="https://images.unsplash.com/photo-1600207438283-a5de6d9df13e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1234&q=80" alt="pp">
          </div>
          <div class="message-content">
            <p class="name">Jessica Bell</p>
            <div class="message">Hi team! Let's get started it.</div>
          </div>
        </div>
        <div class="message-wrapper reverse">
          <div class="profile-picture">
            <img src="https://images.unsplash.com/photo-1500917293891-ef795e70e1f6?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1650&q=80" alt="pp">
          </div>
          <div class="message-content">
            <p class="name">Emmy Lou</p>
            <div class="message">Good morning!🌈</div>
          </div>
        </div>
         <div class="message-wrapper">
          <div class="profile-picture">
            <img src="https://images.unsplash.com/photo-1576110397661-64a019d88a98?ixlib=rb-1.2.1&auto=format&fit=crop&w=1234&q=80" alt="pp">
          </div>
          <div class="message-content">
            <p class="name">Tim Russel</p>
            <div class="message">New design document⬇️</div>
            <div class="message-file">
              <div class="icon sketch">
                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
                  <path fill="#ffd54f" d="M96 191.02v-144l160-30.04 160 30.04v144z"/>
                  <path fill="#ffecb3" d="M96 191.02L256 16.98l160 174.04z"/>
                  <path fill="#ffa000" d="M0 191.02l256 304 256-304z"/>
                  <path fill="#ffca28" d="M96 191.02l160 304 160-304z"/>
                  <g fill="#ffc107">
                    <path d="M0 191.02l96-144v144zM416 47.02v144h96z"/>
                  </g>
                </svg>
              </div>
              <div class="file-info">
                <div class="file-name">NewYear.sketch</div>
                <div class="file-size">120 MB</div>
              </div>
            </div>
          </div>
        </div>
         <div class="message-wrapper">
          <div class="profile-picture">
            <img src="https://images.unsplash.com/photo-1581824283135-0666cf353f35?ixlib=rb-1.2.1&auto=format&fit=crop&w=1276&q=80" alt="pp">
          </div>
          <div class="message-content">
            <p class="name">Ryan Patrick</p>
            <div class="message">Hi team!❤️</div>
            <div class="message">I downloaded the file <a class="mention">@timrussel</a></div>
          </div>
        </div>
         <div class="message-wrapper reverse">
          <div class="profile-picture">
            <img src="https://images.unsplash.com/photo-1500917293891-ef795e70e1f6?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1650&q=80" alt="pp">
          </div>
          <div class="message-content">
            <p class="name">Emmy Lou</p>
            <div class="message">Woooww! Awesome❤️</div>
          </div>
        </div>
      </div>
      <div class="chat-typing-area-wrapper">
        <div class="chat-typing-area">
          <input type="text" placeholder="Type your meesage..." class="chat-input">
          <button class="send-button">
            <svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-send" viewBox="0 0 24 24">
              <path d="M22 2L11 13M22 2l-7 20-4-9-9-4 20-7z"/>
            </svg>
          </button>
        </div>
      </div>
    </div>
    <div class="participants">
      <div class="participant profile-picture">
        <img src="https://images.unsplash.com/photo-1576110397661-64a019d88a98?ixlib=rb-1.2.1&auto=format&fit=crop&w=1234&q=80" alt="pp">
      </div>
      <div class="participant profile-picture">
        <img src="https://images.unsplash.com/photo-1566821582776-92b13ab46bb4?ixlib=rb-1.2.1&auto=format&fit=crop&w=900&q=60" alt="pp">
      </div>
      <div class="participant profile-picture">
        <img src="https://images.unsplash.com/photo-1600207438283-a5de6d9df13e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1234&q=80" alt="pp">
      </div>
      <div class="participant profile-picture">
        <img src="https://images.unsplash.com/photo-1581824283135-0666cf353f35?ixlib=rb-1.2.1&auto=format&fit=crop&w=1276&q=80" alt="pp">
      </div>
      <div class="participant-more">2+</div>
    </div>
  </div>
  <button class="expand-btn">
      <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-message-circle"><path d="M21 11.5a8.38 8.38 0 0 1-.9 3.8 8.5 8.5 0 0 1-7.6 4.7 8.38 8.38 0 0 1-3.8-.9L3 21l1.9-5.7a8.38 8.38 0 0 1-.9-3.8 8.5 8.5 0 0 1 4.7-7.6 8.38 8.38 0 0 1 3.8-.9h.5a8.48 8.48 0 0 1 8 8v.5z"/></svg>
    </button>
</div>
              
            
!

CSS

              
                * {
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100vh;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

button {
  outline : none;
  transition: .2s;
  cursor: pointer;
  
  &:hover {
    opacity: .7;
  }
}

body {
  --app-background: #eaebf5;
  --chat-background: #fff;
  --link-color: #c0c1c5;
  --navigation-bg: #fff;
  --navigation-box-shadow: 0 2px 6px 0 rgba(136, 148, 171, 0.2), 0 24px 20px -24px rgba(71, 82, 107, 0.1);
  --main-color: #3d42df;
  --message-bg: #f3f4f9;
  --message-bg-2: #3d42df;
  --message-text: #2c303a;
  --placeholder-text: #a2a4bc;
  --button-bg: #fff;
}

body.dark {
  --app-background: #262a42;
  --navigation-box-shadow: 0px 0px 8px 0px #282b33;
  --chat-background: #3c3f56;
  --message-bg: #2c3046;
  --message-text: rgba(255,255,255,0.8);
  --placeholder-text: #fff;
  --navigation-bg: #3c3f56;
  --button-bg: #3c3f56;
  --main-color: #6f74ff;
  --message-bg-2: #6f74ff;
  
  .mic {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-mic-off' viewBox='0 0 24 24'%3E%3Cpath d='M1 1l22 22M9 9v3a3 3 0 005.12 2.12M15 9.34V4a3 3 0 00-5.94-.6'/%3E%3Cpath d='M17 16.95A7 7 0 015 12v-2m14 0v2a7 7 0 01-.11 1.23M12 19v4M8 23h8'/%3E%3C/svg%3E%0A");
  }
  
  .camera {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-camera-off' viewBox='0 0 24 24'%3E%3Cpath d='M1 1l22 22M21 21H3a2 2 0 01-2-2V8a2 2 0 012-2h3m3-3h6l2 3h4a2 2 0 012 2v9.34m-7.72-2.06a4 4 0 11-5.56-5.56'/%3E%3C/svg%3E%0A");
  }
  
  .maximize {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-maximize' viewBox='0 0 24 24'%3E%3Cpath d='M8 3H5a2 2 0 00-2 2v3m18 0V5a2 2 0 00-2-2h-3m0 18h3a2 2 0 002-2v-3M3 16v3a2 2 0 002 2h3'/%3E%3C/svg%3E%0A");
  }
  
  .magnifier {
    color: #fff;
  }
  
  .chat-header {
    border-color: var(--message-bg);
  }
  
  .btn-close-right {
    color: #fff;
  }
}

a { text-decoration: none; }

.app-container {
  background-color: var(--app-background);
  width: 100%;
  height: 100%;
  font-family: 'DM Sans', sans-serif;
  display: flex;
  transition: .2s;
}

.left-side {
  position: relative;
  padding: 16px;
  flex-basis: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.navigation {
  display: flex;
  flex-direction: column;
  background-color: var(--navigation-bg);
  padding: 24px;
  border-radius: 10px;
  box-shadow: var(--navigation-box-shadow);
}

.nav-link + .nav-link {
  margin-top: 32px;
}

.nav-link:hover svg {
  color: #3d42df;
}

.icon svg {
  width: 24px;
  height: 24px;
  color: var(--link-color);
  transition: .2s ease-in;
}

.right-side {
  margin-left: auto;
  flex-basis: 400px;
  height: 100%;
  padding: 16px;
  position: relative;
  transition: all 300ms cubic-bezier(0.190, 1.000, 0.560, 1.000);
  
  &.show {
    display: block;
    transform: translateX(0);
  }
}

.chat-container {
  background-color: var(--chat-background);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  height: calc(100% - 72px);
}

.chat-header {
  padding: 16px;
  border-bottom: 1px solid #f5f5f5;
}

.chat-header-button {
  background-color: var(--main-color);
  padding: 12px 16px 12px 40px;
  border: none;
  border-radius: 4px;
  color: #fff;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg' fill='%23fff'%3E%3Cpath d='M479.9 187.52l-90.19 68.53v-52.6a20 20 0 00-20-20H20a20 20 0 00-20 20V492a20 20 0 0020 20h349.71a20 20 0 0020-20v-52.6l90.18 68.52c13.05 9.91 32.1.67 32.1-15.92V203.45c0-16.5-18.94-25.92-32.1-15.93zM349.7 472H40V223.45h309.71zM472 451.68l-82.29-62.53V306.3L472 243.77zM87.96 79.24C129.62 28.88 190.86 0 256 0c65.13 0 126.37 28.88 168.03 79.24a20 20 0 01-30.82 25.5A177.6 177.6 0 00256 40a177.6 177.6 0 00-137.21 64.73 20 20 0 11-30.83-25.5zm240.36 32.21a20 20 0 11-21.02 34.03 97.57 97.57 0 00-51.3-14.53 97.6 97.6 0 00-51.31 14.53 20 20 0 11-21.02-34.03A137.53 137.53 0 01256 90.95c25.59 0 50.6 7.09 72.32 20.5zm0 0'/%3E%3C/svg%3E%0A");
  background-repeat: no-repeat;
  background-position: center left 12px;
  background-size: 16px;
  font-size: 14px;
}

.chat-area {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.profile-picture {
  border-radius: 8px;
  width: 32px;
  height: 32px;
  overflow: hidden;
  margin-right: 12px;
  flex-shrink: 0;
  
  img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
}

.message-wrapper {
  display: flex;
}

.name {
  margin : 0;
  line-height: 16px;
  font-size: 12px;
  font-weight: 700;
  color: var(--message-text);
}

.message {
  margin-top: 8px;
  background-color: var(--message-bg);
  padding: 8px 16px;
  border-radius: 0 12px 12px 12px;
  font-size: 12px;
  line-height: 16px;
  max-width: calc(100% - 32px);
  color: var(--message-text);
}

.message-wrapper {
  padding: 16px 0;
  
  &.reverse {
    flex-direction: row-reverse;
    
    .message {
      background-color: var(--message-bg-2);
      color: #fff;
      margin-left: auto;
      border-radius: 16px 0px 16px 16px;
    }
    
    .profile-picture {
      margin-right: 0px;
      margin-left: 12px;
    }
    
    .name {
      text-align: right;
    }
  }
}

.message-file {
  border: 1px solid var(--message-bg);
  width: 100%;
  margin-top: 16px;
  border-radius: 4px;
  padding: 8px;
  display: flex;
  
  .sketch {
    border-radius: 4px;
    padding: 2px;
    background-color: #fdeee2;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 32px;
    height: 32px;
    
    svg {
      width: 20px;
      height: 20px;
    }
  }
}

.file-info {
  flex: 1;
  padding: 0 40px 0 8px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' stroke='%23b8b8b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-download' viewBox='0 0 24 24'%3E%3Cpath d='M21 15v4a2 2 0 01-2 2H5a2 2 0 01-2-2v-4M7 10l5 5 5-5M12 15V3'/%3E%3C/svg%3E%0A");
  background-position: center right 12px;
  background-size: 20px;
  background-repeat: no-repeat;
  font-size: 12px;
}

.file-name {
  color: var(--message-text);
}

.file-size {
  color: #b8b8b8;
}

.mention {
  color: #7c80fd;
}

.chat-typing-area-wrapper {
  padding: 16px;
}

.chat-typing-area {
  display: flex;
  border-radius: 10px;
  padding: 8px;
  box-shadow: var(--navigation-box-shadow);
  background-color: var(--message-bg);
  
  .dark & {
    box-shadow: none;
  }
}

.chat-input {
  border: none;
  font-size: 14px;
  line-height: 24px;
  outline: none;
  color: var(--message-text);
  flex: 1;
  background-color: transparent;
  
  &:placeholder {
    color: var(--placeholder-text);
  }
}

.send-button {
  color: #fff;
  background-color: var(--main-color);
  border-radius: 8px;
  border: none;
  width: 32px;
  height: 32px;
  display: flex;
  justify-content: center;
  align-items: center;
  
  svg {
    width: 20px;
    height: 20px;
  }
}

.app-main {
  flex: 1;
  width: 100%;
  padding: 72px 32px 16px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.video-call-wrapper {
  width: 100%;
  height: 100%;
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-wrap: wrap;
}

.video-participant {
  width: 33.3%;
  height: 50%;
  position: relative;
  
  img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
}

.name-tag {
  position: absolute;
  bottom: 12px;
  right: 12px;
  font-size: 12px;
  color: #fff;
  background-color: rgba(0,15,47,0.5);
  border-radius: 4px;
  padding: 4px 12px;
}

.participant-actions {
  position: absolute;
  display: flex;
  left: 12px;
  top: 12px;
}

.btn-mute, .btn-camera {
  width: 32px;
  height: 32px;
  border-radius: 4px;
  background-color: rgba(0,15,47,0.5);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 16px;
  border: none;
}

.btn-mute {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-mic-off' viewBox='0 0 24 24'%3E%3Cpath d='M1 1l22 22M9 9v3a3 3 0 005.12 2.12M15 9.34V4a3 3 0 00-5.94-.6'/%3E%3Cpath d='M17 16.95A7 7 0 015 12v-2m14 0v2a7 7 0 01-.11 1.23M12 19v4M8 23h8'/%3E%3C/svg%3E%0A");
  margin-right: 4px;
}

.btn-camera {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-camera-off' viewBox='0 0 24 24'%3E%3Cpath d='M1 1l22 22M21 21H3a2 2 0 01-2-2V8a2 2 0 012-2h3m3-3h6l2 3h4a2 2 0 012 2v9.34m-7.72-2.06a4 4 0 11-5.56-5.56'/%3E%3C/svg%3E%0A");
}

.video-call-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 64px;
  max-width: 500px;
}

.video-action-button {
  background-repeat: no-repeat;
  background-size: 24px;
  border: none;
  height: 48px;
  margin: 0 8px;
  box-shadow: var(--navigation-box-shadow);
  border-radius: 8px;
  width: 48px;
  cursor: pointer;
  outline: none;
  background-color: var(--button-bg);
  
  &.mic {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' stroke='%232c303a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-mic-off' viewBox='0 0 24 24'%3E%3Cpath d='M1 1l22 22M9 9v3a3 3 0 005.12 2.12M15 9.34V4a3 3 0 00-5.94-.6'/%3E%3Cpath d='M17 16.95A7 7 0 015 12v-2m14 0v2a7 7 0 01-.11 1.23M12 19v4M8 23h8'/%3E%3C/svg%3E%0A");
    background-position: center;
  }
  
  &.camera {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' stroke='%232c303a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-camera-off' viewBox='0 0 24 24'%3E%3Cpath d='M1 1l22 22M21 21H3a2 2 0 01-2-2V8a2 2 0 012-2h3m3-3h6l2 3h4a2 2 0 012 2v9.34m-7.72-2.06a4 4 0 11-5.56-5.56'/%3E%3C/svg%3E%0A");
    background-position: center;
  }
  
  &.maximize {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' stroke='%232c303a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-maximize' viewBox='0 0 24 24'%3E%3Cpath d='M8 3H5a2 2 0 00-2 2v3m18 0V5a2 2 0 00-2-2h-3m0 18h3a2 2 0 002-2v-3M3 16v3a2 2 0 002 2h3'/%3E%3C/svg%3E%0A");
    background-position: center;
  }
  
  &.endcall {
    color: #ff1932;
    width: auto;
    font-size: 14px;
    padding-left: 42px;
    padding-right: 12px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ff1932' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-phone-missed'%3E%3Cline x1='23' y1='1' x2='17' y2='7'/%3E%3Cline x1='17' y1='1' x2='23' y2='7'/%3E%3Cpath d='M22 16.92v3a2 2 0 0 1-2.18 2 19.79 19.79 0 0 1-8.63-3.07 19.5 19.5 0 0 1-6-6 19.79 19.79 0 0 1-3.07-8.67A2 2 0 0 1 4.11 2h3a2 2 0 0 1 2 1.72 12.84 12.84 0 0 0 .7 2.81 2 2 0 0 1-.45 2.11L8.09 9.91a16 16 0 0 0 6 6l1.27-1.27a2 2 0 0 1 2.11-.45 12.84 12.84 0 0 0 2.81.7A2 2 0 0 1 22 16.92z'/%3E%3C/svg%3E");
    background-size: 20px;
    background-position: center left 12px;
  }
  
  &.magnifier {
    padding: 0 12px;
    display: flex;
    align-items: center;
    width: auto;
    flex-grow: 0;
    color: #2c303a;
    
    svg {
      width: 20px;
      flex-shrink: 0;
    }
    
    span {
      display: block;
      margin: 0 16px;
    }
  }
}

.participants {
  display: flex;
  background-color: var(--button-bg);
  box-shadow: var(--navigation-box-shadow);
  margin-top: 16px;
  padding: 12px;
  border-radius: 8px;
  max-width: 232px;
  margin-left: auto;
}

.participant-more {
  background-color: #e1e0e1;
  font-size: 14px;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #636181;
  font-weight: 700;
  border-radius: 8px;
  min-width: 32px;
}

.mode-switch  {
  z-index: 1;
  position: absolute;
  top: 20px;
  left: 36px;
  background-color: var(--chat-background);
  border: none;
  color: #ddd;
  outline: none;
  cursor: pointer;
  box-shadow: var(--navigation-box-shadow);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  transform-origin: center;
  
  svg {
    width:0;
    height: 24px;
    transition: all .3s ease-in;
    transform-origin: center;
  }
  
  .moon { opacity: 0; }
  .sun { width: 24px; }
}

.dark .moon {
  opacity: 1;
  width: 24px;
}

.dark .sun {
  opacity: 0;
  width: 0;
}

.expand-btn {
  position: absolute;
  right: 32px;
  top: 24px;
  border: none;
  background-color: var(--chat-background);
  border-radius: 4px;
  padding: none;
  color: var(--message-text);
  width: 40px;
  height: 40px;
  justify-content: center;
  align-items: center;
  
  display: none;
  
  &.show {
    display: flex;
  }
}

.btn-close-right {
  border: none;
  background-color: transparent;
  position: absolute;
  top: 24px;
  right: 24px;
  color: var(--light-font);
  outline: none;
  cursor: pointer;
  
  display: none;
}

@media screen and (max-width: 900px) {
  .expand-btn {
    display: block;
  }
  
  .right-side {
    position: absolute;
    right: 0px;
    background-color: var(--chat-background);
    transform: translateX(100%);
    z-index: 2;
    width: 100%;
    
    &.show {
      transform: translateX(0);
    }
  }
  
  .btn-close-right {
    display: block;
  }
}

@media screen and (max-width: 520px) {
  .left-side {
    display: none;
  }
  
  .app-main {
    padding: 72px 16px 16px 16px;
  }
  
  .expand-btn {
    right: 16px;
  }
  
  .mode-switch {
    left: 16px;
  }
  
  .video-call-actions {
    padding-top: 32px;
  }
  
  .video-action-button {
    width: 32px;
    height: 32px;
    background-size: 14px;
    margin: 0 4px;
  }
  
  .video-action-button.endcall {
    background-size: 14px;
    font-size: 12px;
    padding-left: 36px;
  }
  
  .video-action-button.magnifier svg {
    width: 14px;
  }
  
  .video-action-button.magnifier span {
    margin: 0 4px;
    font-size: 12px;
  }
}

@media screen and (max-width: 520px) and (max-height: 720px) {
  .video-participant {
    width: 50%;
    height: 33.3%;
  }
}
              
            
!

JS

              
                $(document).ready(function(){
  $('button.mode-switch').click(function(){
    $('body').toggleClass('dark');
  });
  
  $(".btn-close-right").click(function () {
    $(".right-side").removeClass("show");
    $(".expand-btn").addClass("show");
  });
  
  $(".expand-btn").click(function () {
    $(".right-side").addClass("show");
    $(this).removeClass("show");
  });
});
              
            
!
999px

Console