html {
    height: 100%;
}
body {
    margin: 0;
    padding: 0;
    height: 100%;
}

#main {
    margin: auto;
    min-height: 100%;
    width: 960px;
    padding: 30px;
    border-left: 1px solid #aaa;
    border-right: 1px solid #aaa;
}
#pdf {
margin: 0 4px -3px 0;
}