body {
    width: 100%; 
    height: 100%;
    margin: 0px;
    overflow: hidden;
}

#ad {
    display: block;
    border: rgb(145, 153, 153) 0px solid;
    overflow: hidden;
    width: 300px;
    height: 250px;
    -moz-user-select: -moz-none;
    -khtml-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
}