.actGotop {
    position: fixed;
    bottom: 100px;
    right: 5%;
    width: 85px;
    height: 100px;
    display: none;
}

.actGotop a, .actGotop a:link {
    width: 85px;
    height: 100px;
    display: inline-block;
    background: url(backToTop_res/backToTop.png) no-repeat;
    background-size: contain;
    outline: none;
}

.actGotop a:hover {
    background: url(backToTop_res/backToTop.gif) no-repeat;
    background-size: contain;
    outline: none;
}