body {
  width: 100vw;
  height: 100vh;
  /**
 * Diagonal stripes - linear-gradient() method
 */

background: linear-gradient(45deg, 
              #fb3 25%, #58a 0, #58a 50%,
              #fb3 0, #fb3 75%, #58a 0);
background-size: 42.4px 42.4px;
}