body
{
width:100%;
height:100%;
background: #e6e6e6 url("https://images.cnblogs.com/cnblogs_com/Hakuna-Matata/1097624/o_002.jpg") no-repeat top center fixed;
}
html
{
opacity: 0.8;
            filter:alpha(opacity=80);
            
}
.clockdiv{
    text-align: center;
}