body{
background: rgba(12, 100, 129, 1) url(https://images.cnblogs.com/cnblogs_com/aground/990009/o_13013dce973d595af0bdedd22d706487.jpg);
 background-size: cover;
background-position: 50% 5%;
    font-family: "Open Sans", Helvetica, Arial, sans-serif;
    font-size: 12px;
    min-height: 101%;
background-repeat:no-repeat; background-attachment:fixed;
}
#navigator {
    background-color: rgba(0,0,0,0.8);
}
#main {
    background-color: rgba(255,255,255,0.70);
}
#mainContent {
    background-color: rgba(0,0,0,0);
}