#bottomCircleButton{
    width: 50px;
    height: 50px;
    position: fixed;
    left: 0;
    bottom: 0;
    background: #3f98ef;
    opacity: 0.6;
    border-radius: 50%;
  }
  #bottomCircleButton a{
    position: relative;
    display: block;
    width: 50px;
    height: 50px;
    text-decoration: none;
  }
  #bottomCircleButton a::before{
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    content: '\f102';
    font-size: 25px;
    color: #fff;
    position: absolute;
    width: 25px;
    height: 25px;
    top: -5px;
    bottom: 0;
    right: 0;
    left: 0;
    margin: auto;
    text-align: center;
  }