.back-top-1 {
    margin: 0;
    right: 47px;
    }

  .back-top-2 {
    margin-left: 936px;
    } 

  #back-top {
    position: fixed;
    bottom: 14px;
    margin-left: 936px;
    }

  #back-top a {
    width: 40px;
    display: block;
    text-align: center;
    font: 11px/100% Arial, Helvetica, Sans-Serif;
    text-transform: uppercase;
    text-decoration: none;
    color: #ddd;

    /* transition */
    -webkit-transition: 0.5s;
    -moz-transition: 0.5s;
    transition: 0.5s;
    }

  #back-top a:hover {
    color: #ddd;
    }

  /* arrow icon (span tag) */
  #back-top span {
    background: url(top.png) no-repeat center center;      
    border: 1px solid lightgray;
    display: block;
    height: 40px;
    width: 40px;

    /* transition */
    -webkit-transition: 0.5s;
    -moz-transition: 0.5s;
    transition: 0.5s;
    }

  #back-top a:hover span {
    background-color: #ddd;
    }