.btn-wsp {
      position: fixed;
      width: 68px;
      height: 66px;
      line-height: 40px;
      bottom: 30px;
      right: 20px;
      background: #0df053
      /*#25d366*/
      ;
      color: #fff;
      border-radius: 55px;
      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: #0df053
      /*#20ba5a*/
      ;
      text-decoration: none;
      background: #fff;
  }
  
  @media only screen and (min-width:320px) and (max-width:768px) {
      .btn-wsp {
          width: 63px;
          height: 63px;
          line-height: 66px;
      }
  }