body{background-color:#ffffff;background-image:linear-gradient(to bottom,rgba(220,220,220,0.5) 1px,transparent 1px),linear-gradient(to right,rgba(220,220,220,0.5) 1px,transparent 1px),linear-gradient(to bottom,transparent 50%,#ffffff 100%);background-size:20px 20px;background-attachment:fixed}