body {
background-color:#269;
background-image: linear-gradient(#fff 2px, transparent 2px),
linear-gradient(90deg, #fff 2px, transparent 2px),
linear-gradient(rgba(255,255,255,.3) 1px, transparent 1px),
linear-gradient(90deg, rgba(255,255,255,.3) 1px, transparent 1px);
background-size:100px 100px, 100px 100px, 20px 20px, 20px 20px;
background-position:-2px -2px, -2px -2px, -1px -1px, -1px -1px
}