<!-- No html -->
body {
  background: linear-gradient(
0deg
, white 15%, transparent 15%) 0 6px, linear-gradient(
90deg
, white 50%, transparent 50%) -10px 0, linear-gradient(
120deg
, black 50%, transparent 50%), linear-gradient(
60deg
, transparent 49%, black 50%), white;
    background-size: 40px 40px;
}
// No JS

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.