#back-to-top {
    position: fixed;
    bottom: 10px;
    right: 10px;
    z-index: 9999;
    width: 36px;
    height: 36px;
    text-align: center;
    line-height: 30px;
    background: #f5f5f5;
    color: #444;
    cursor: pointer;
    border: 0;
    border-radius: 4px;
    text-decoration: none;
    transition: opacity 0.2s ease-out;
    opacity: 0;
    background: #eee url("/include/backtotop/backtotop.png") center center no-repeat;
    border: 1px solid #ccc;
}
#back-to-top:hover {
    background-color: #ccc;
}
#back-to-top.show {
    opacity: 0.7;
}