#mainContent {
    width: 765px;
    background: white;
    box-shadow: 0px 0px 8px #999;
    -moz-box-shadow: 0px 0px 8px #999;
    -web-kit-shadow: 0px 0px 8px #999;
    border-radius:12px;
    moz-border-radius: 12px;
    web-kit-shadow:12px;
    float: left;
    display: inline-block;
}