style.css

html, body {
    background: #efefef;      
    height:100%;  
  }
  #center-text {          
    display: flex;
    flex: 1;
    flex-direction:column; 
    justify-content: center;
    align-items: center;  
    height:100%;
    
  }
  #chat-circle {
    position: fixed;
    bottom: 50px;
    right: 50px;
    background: #14b7a8;
    width: 80px;
    height: 80px;  
    border-radius: 50%;
    color: white;
    padding: 28px;
    cursor: pointer;
    box-shadow: 0px 3px 16px 0px rgba(0, 0, 0, 0.6), 0 3px 1px -2px rgba(0, 0, 0, 0.2), 0 1px 5px 0 rgba(0, 0, 0, 0.12);
  }
  
  .btn#my-btn {
       background: white;
      padding-top: 13px;
      padding-bottom: 12px;
      border-radius: 45px;
      padding-right: 40px;
      padding-left: 40px;
      color: #14b7a8;
  }

  .btn1#my-btn1 {
    background: white;
   padding-top: 13px;
   font-size: 40px
   padding-bottom: 12px;
   /* border-radius: 45px; */
   padding-right: 40px;
   padding-left: 40px;
   color: #14b7a8;
}

  #chat-overlay {
      background: rgba(255,255,255,0.1);
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      border-radius: 50%;
      display: none;
  }
  
  
  .chat-box {
    display:none;
    background: #efefef;
    position:fixed;
    right:30px;
    bottom:50px;  
    width:350px;
    max-width: 85vw;
    max-height:100vh;
    border-radius:5px;  
  /*   box-shadow: 0px 5px 35px 9px #464a92; */
    box-shadow: 0px 5px 35px 9px #ccc;
  }

  .chat-box-toggle {
    float:right;
    margin-right:15px;
    cursor:pointer;
  }
  .chat-box-header {
    background: #14b7a8;
    height:70px;
    border-top-left-radius:5px;
    border-top-right-radius:5px; 
    color:white;
    text-align:center;
    font-size:20px;
    padding-top:17px;
  }
  .chat-box-body {
    position: relative;  
    height:370px;  
    height:auto;
    border:1px solid #ccc;  
    overflow: hidden;
  }
  .chat-box-body:after {
    content: "";
    background-image: url('data:image/svg+xml;base64,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');
    opacity: 0.1;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    height:100%;
    position: absolute;
    z-index: -1;   
  }
  #chat-input {
    background: #f4f7f9;
    width:100%; 
    position:relative;
    height:47px;  
    padding-top:10px;
    padding-right:50px;
    padding-bottom:10px;
    padding-left:15px;
    border:none;
    resize:none;
    outline:none;
    border:1px solid #ccc;
    color:#888;
    border-top:none;
    border-bottom-right-radius:5px;
    border-bottom-left-radius:5px;
    overflow:hidden;  
  }
  .chat-input > form {
      margin-bottom: 0;
  }
  #chat-input::-webkit-input-placeholder { /* Chrome/Opera/Safari */
    color: #ccc;
  }
  #chat-input::-moz-placeholder { /* Firefox 19+ */
    color: #ccc;
  }
  #chat-input:-ms-input-placeholder { /* IE 10+ */
    color: #ccc;
  }
  #chat-input:-moz-placeholder { /* Firefox 18- */
    color: #ccc;
  }
  .chat-submit {  
    position:absolute;
    bottom:3px;
    right:10px;
    background: transparent;
    box-shadow:none;
    border:none;
    border-radius:50%;
    color:#14b7a8;
    width:35px;
    height:35px;  
  }
  .chat-logs {
    padding:15px; 
    height:370px;
    overflow-y:scroll;
  }
  
  .chat-logs::-webkit-scrollbar-track
  {
      -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
      background-color: #F5F5F5;
  }
  
  .chat-logs::-webkit-scrollbar
  {
      width: 5px;  
      background-color: #F5F5F5;
  }
  
  .chat-logs::-webkit-scrollbar-thumb
  {
      background-color: #14b7a8;
  }
  
  
  
  @media only screen and (max-width: 500px) {
     .chat-logs {
          height:40vh;
      }
  }
  
  .chat-msg.user > .msg-avatar img {
    width:45px;
    height:45px;
    border-radius:50%;
    float:left;
    width:15%;
  }
  .chat-msg.self > .msg-avatar img {
    width:45px;
    height:45px;
    border-radius:50%;
    float:right;
    width:15%;
  }
  .cm-msg-text {
    background:white;
    padding:10px 15px 10px 15px;  
    color:#666;
    max-width:75%;
    float:left;
    margin-left:10px; 
    position:relative;
    margin-bottom:20px;
    border-radius:30px;
  }
  .chat-msg {
    clear:both;    
  }
  .chat-msg.self > .cm-msg-text {  
    float:right;
    margin-right:10px;
    background: #14b7a8;
    color:white;
  }
  .cm-msg-button>ul>li {
    list-style:none;
    float:left;
    width:50%;
  }
  .cm-msg-button {
      clear: both;
      margin-bottom: 70px;
  }