body {
  --stripe: #cfd8dc;
  --bg: #e1e1e1;

  background: linear-gradient(135deg, var(--bg) 25%, transparent 25%) -50px 0,
    linear-gradient(225deg, var(--bg) 25%, transparent 25%) -50px 0,
    linear-gradient(315deg, var(--bg) 25%, transparent 25%),
    linear-gradient(45deg, var(--bg) 25%, transparent 25%);
  background-size: 100px 100px;
  background-color: var(--stripe);
}

External CSS

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External JavaScript

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