CodePen Embed - Blueprint pattern (CSS3)

body {
  background-color: #269;
  background-image:
    linear-gradient(rgba(255,255,255,.5) 2px, transparent 2px),
    linear-gradient(90deg, rgba(255,255,255,.5) 2px, transparent 2px),
    linear-gradient(rgba(255,255,255,.28) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.28) 1px, transparent 1px);
  background-size: 100px 100px, 100px 100px, 20px 20px, 20px 20px;
  background-position: -2px -2px, -2px -2px, -1px -1px, -1px -1px;
}

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