Edit in JSFiddle

body {
background-color: #FFFFEF;
background-image: 
linear-gradient(90deg, transparent 98px, #ED82AD 98px, #ED82AD 100px, transparent 100px),
linear-gradient(#eee 1px, transparent 0px),
linear-gradient(90deg, #eee 1px, transparent 0px);
background-size:100% 100%, 20px 20px, 20px 20px;
background-position: 0 0, -1px -1px, -1px 1px;
}