.background{background:radial-gradient(#000 15%,transparent 16%) 0 0,radial-gradient(#000 15%,transparent 16%) 8px 8px,radial-gradient(rgba(255,255,255,.1) 15%,transparent 20%) 0 1px,radial-gradient(rgba(255,255,255,.1) 15%,transparent 20%) 8px 9px;background-color:#282828;background-size:16px 16px;}