.fab {
    background: #33be7d;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    text-align: center;
    color: #fff;
    box-shadow: rgb(0 0 0 / 40%) 2px 2px 6px;
    position: fixed;
    bottom: 60px;
    right: 32px;
    font-size: 2.6667em;
    display: inline-block;
    cursor: pointer;
    z-index: 99;
  }
  
  .fab>img {
    width: 34px;
    margin-top: 18px;
    object-fit: contain;
  }
  
  .fab span {
    vertical-align: middle;
  }
  
  .fab.child {
    background: none;
    box-shadow: none;
    right: 32px;
    width: 38px;
    height: 38px;
    display: none;
    opacity: 0;
    font-size: 2em;
    cursor: pointer;
  }
  
  .fab.child>div {
    position: absolute;
    right: 48px;
    bottom: 2px;
    width: 234px;
    text-align: right;
  }
  
  .fab.child>div>span {
    font-size: 14px;
    background-color: #000000b8;
    padding: 3px 6px;
    border-radius: 5px;
    color: #ffffff;
    box-shadow: rgb(0 0 0 / 20%) 2px 2px 5px;
  }
  
  .fab.child>img {
    width: 30px;
    height: 30px;
    margin-top: 12px;
    object-fit: contain;
    transition: transform 0.4s;
  }
  
  .fab.child:hover>img {
    -ms-transform: scale(1.4);
    /* IE 9 */
    -webkit-transform: scale(1.4);
    /* Safari 3-8 */
    transform: scale(1.4);
  }
  
  .backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #0000004d;
    opacity: 0.9;
    display: none;
    z-index: 98;
  }
  
  @media only screen and (max-width: 480px) {
    .fab {
      width: 54px;
      height: 54px;
      right: 18px;
    }
  
    .fab>img {
      width: 24px;
      margin-top: 14px;
    }
  
    .fab.child {
      right: 18px;
      width: 40px;
      height: 40px;
    }
  
    .fab.child>img {
      width: 26px;
      height: 26px;
      margin-top: 4px;
      object-fit: contain;
    }
  
    .fab.child>div {
      right: 45px;
      bottom: 13px;
    }
  }