#scroll {
    position: fixed;
    right: 10px;
    bottom: 10px;
    cursor: pointer;
    width: 50px;
    height: 50px;
    background-color: #3498db;
    text-indent: -9999px;
    display: none;
    -webkit-border-radius: 60px;
    -moz-border-radius: 60px;
    border-radius: 60px;
}

    #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)";
    }