#scroll_ {
    position: fixed;
    right: 10px;
    bottom: 10px;
    cursor: pointer;
    width: 50px;
    height: 50px;
    background-color: #888888;
    text-indent: -9999px;
    display: none;
    -webkit-border-radius: 60px;
    -moz-border-radius: 60px;
    border-radius: 60px;
    z-index: 999;
}

#scroll_ span {
    position: absolute;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -12px;
    height: 0;
    width: 0;
    border: 8px solid transparent;
    border-bottom-color: #ffffff;
}

#scroll_:hover {
    background-color: #e74c3c;
    opacity: 1;
    filter: "alpha(opacity=100)";
    -ms-filter: "alpha(opacity=100)";
}