tedbyron

:root {
  background:
    repeat 0 0, 5px 5px
    linear-gradient(45deg, #00000019 25%, #0000 0 75%, #00000019 0 0),
    linear-gradient(45deg, #00000019 25%, #0000 0 75%, #00000019 0 0),
    #fff;
  background-size: 10px 10px;
}