.mod-returnTop {
min-width: 950px;
width: 100%;
height: 0px;
position: fixed;
bottom: 0;
}
.mod-returnTop a {
overflow: hidden;
position: relative;
display: block;
top: -38px;
width: 60px;
height: 0;
padding-top: 38px;
margin: 0 30px 0 auto;
background: #ededed url(/share4/images/mod-returnTop/btn_01.png);
}
* html .mod-returnTop {
display: none;
}

@media (max-width: 640px) {
  .mod-returnTop { display: none; }
}