.btn-wsp {
    position: fixed;
    width: 60px;
    height: 60px;
    line-height: 63px;
    bottom: 65px;
    right: 25px;
    background: #25d366;
    color: #FFF;
    border-radius: 50px;
    text-align: center;
    font-size: 35px;
    box-shadow: 0px 1px 10px rgba(0,0,0,0.3);
    z-index: 100;
    transition: all 300ms ease;
  }
  
  .btn-wsp:hover {
    background: #20ba5a;
  }
  
  @media only screen and (min-width:320px) and (max-width:768px) {
    .btn-wsp {
      width: 63px;
      height: 63px;
      line-height: 66px;
    }
  }
  
  * {
    margin: 0;
    padding: 0;
    list-style: none;
    text-decoration: none;
  }