html {
    content: '';
    display: block;
    position: relative;
    bottom: 0;
    height: 120px;
    background: -moz-linear-gradient(top, rgba(255,255,255,0), #d6d6d6);
}

div{
    height:100%;
    width:100%;
    background: -moz-linear-gradient(top, rgba(255,255,255,0), #d6d6d6);
}