#myBtn {
     width: 50px;
     height: 50px;
     padding: 10px 16px;
     font-size: 18px;
     line-height: 1.33;
     border-radius: 25px;
     background-color: #FF9800;
     position: fixed;
     z-index: 998;
     bottom: 30px;
     right: 30px;
     
 }

 #myBtn::after {
     content: "\f062";
     font-family: FontAwesome;
     font-weight: normal;
     font-style: normal;
     font-size: 2em;
     display:flex;
     justify-content: center;
      align-items: center;
     line-height: 50%;
     color: #fff;
     
     z-index: 999;
     
 }

 #myBtn:hover {
     background-color: #191970;
 }