#BackTop{

    cursor: pointer;

    display: none;

    position: fixed;

    bottom:50px;

    right: 50px;

    background: #fff;

    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.4);

    overflow: hidden;

    width: 100px;

    height: 50px;

    text-align: center;

    z-index: 1300;

    -webkit-border-radius: 10px;

    border-radius:10px;

    border: 3px solid;

    border-color: #f4f4f4;

    font-family: tahoma,arial;

    filter:progid:DXImageTransform.Microsoft.Alpha(opacity=50); /* IE 5.5+*/

    -moz-opacity: 0.5; /* Mozilla 1.6 и ниже */

    -khtml-opacity: 0.5; /* Konqueror 3.1, Safari 1.1 */

    opacity: 0.5; /* CSS3 - Mozilla 1.7b +, Firefox 0.9 +, Safari 1.2+, Opera 9+ */

    -moz-border-radius: 10px; /* Firefox */

    -webkit-border-radius: 10px; /* Safari, Chrome */

    -khtml-border-radius: 10px; /* KHTML */

    border-radius: 10px; /* CSS3 */

    /* Для плохих IE */

    behavior: url(border-radius.htc); /* учим IE border-radius */

}

#BackTop:hover{

    opacity: 1;

}

#BackTop a{ text-decoration: none;}

#BackTop .BackTopText{ font-size: 20px; line-height: 50px; width: 100%; display: block;}