tab.css

/* Tab style */
#scrollUp {
    bottom: 0;
    right: 30px;
    width: 70px;
    height: 70px;
    margin-bottom: -10px;
    padding: 10px 5px;
    font: 14px/20px sans-serif;
    text-align: center;
    text-decoration: none;
    text-shadow: 0 1px 0 #fff;
    color: #828282;
    -webkit-box-shadow: 0 0 2px 1px rgba(0, 0, 0, 0.2);
    -moz-box-shadow: 0 0 2px 1px rgba(0, 0, 0, 0.2);
    box-shadow: 0 0 2px 1px rgba(0, 0, 0, 0.2);
    background-color: #E6E6E6;
    background-image: -moz-linear-gradient(top, #EBEBEB, #DEDEDE);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#EBEBEB), to(#DEDEDE));
    background-image: -webkit-linear-gradient(top, #EBEBEB, #DEDEDE);
    background-image: -o-linear-gradient(top, #EBEBEB, #DEDEDE);
    background-image: linear-gradient(to bottom, #EBEBEB, #DEDEDE);
    background-repeat: repeat-x;
    -webkit-transition: margin-bottom 150ms linear;
    -moz-transition: margin-bottom 150ms linear;
    -o-transition: margin-bottom 150ms linear;
    transition: margin-bottom 150ms linear;
}

#scrollUp:hover {
    margin-bottom: 0;
}