#page-top{
    width: 50px;
    height: 50px;
    position: fixed;
    right: 0;
    bottom: 0;
    background: #007c45;
    opacity: 0.6;
    font-size: 18px;
  }

  #page-top a{
    display: block;
    position: relative;
    width: 50px;
    height: 50px;
    text-decoration: none;
    color: #fff;
  }
  #page-top i{
    position: absolute;
    top: 40%;
    left: 50%;
    transform: translateY(-40%) translateX(-50%);
  }

  #page-top a:hover{
    background-color: #007c45;
  }

.blue{color:#528fff;}