Фоновое изображение

<div class="zig-zag"></div>

.zig-zag {
  width: 240px;
  height: 240px;
  background-color: #fff;
  background-image: linear-gradient(135deg, #000 25%, transparent 25%),
    linear-gradient(225deg, #000 25%, transparent 25%),
    linear-gradient(315deg, #000 25%, transparent 25%),
    linear-gradient(45deg, #000 25%, transparent 25%);
  background-position: -30px 0, -30px 0, 0 0, 0 0;
  background-size: 60px 60px;
  background-repeat: repeat;
}

<div class="stripes"></div>

.stripes {
  width: 240px;
  height: 240px;
  background-color: #fff;
  background-image: linear-gradient(90deg, transparent 50%, #000 50%);
  background-size: 60px 60px;
  background-repeat: repeat;
}

<div class="polka-dot"></div>

.polka-dot {
  width: 240px;
  height: 240px;
  background-color: #000;
  background-image: radial-gradient(#fff 10%, transparent 11%),
    radial-gradient(#fff 10%, transparent 11%);
  background-size: 60px 60px;
  background-position: 0 0, 30px 30px;
  background-repeat: repeat;
}

<div class="checkerboard"></div>

.checkerboard {
  width: 240px;
  height: 240px;
  background-color: #fff;
  background-image: linear-gradient(
      45deg,
      #000 25%,
      transparent 25%,
      transparent 75%,
      #000 75%,
      #000
    ),
    linear-gradient(
      -45deg,
      #000 25%,
      transparent 25%,
      transparent 75%,
      #000 75%,
      #000
    );
  background-size: 60px 60px;
  background-repeat: repeat;
}