@media print {

      html,
      body {
        display: none;
        /* hide whole page */
      }
    }

    #button {
      display: inline-block;
      background-color: #f1ba2e;
      width: 50px;
      height: 50px;
      text-align: center;
      border-radius: 4px;
      position: fixed;
      bottom: 30px;
      right: 30px;
      transition: background-color .3s,
        opacity .5s, visibility .5s;
      opacity: 0;
      visibility: hidden;
      z-index: 1000;
    }

    #button::after {
      content: "\f077";
      font-family: FontAwesome;
      font-weight: normal;
      font-style: normal;
      font-size: 2em;
      line-height: 50px;
      color: #fff;
    }

    #button:hover {
      cursor: pointer;
      background-color: #333;
    }

    #button:active {
      background-color: #555;
    }

    #button.show {
      opacity: 1;
      visibility: visible;
    }