/* scroll up */
#toTop {
    position:fixed;
    z-index:9999;
    bottom:10px;
    left:10px;
    background: url('data:image/png;base64,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') no-repeat #ddd;
    background-size: 25px;
    background-position-x: 7px;
    background-position-y: 6px;
    border: 1px solid #999;
    border-radius: 10px;
    cursor: pointer;
    text-decoration: none;
    width: 41px;
    height: 40px;
    opacity: 0.5;
}
#toTop:hover {
    opacity: 1;    
}