.campo-color-checkerboard{background-image:linear-gradient(45deg,#ccc 25%,#0000 25%),linear-gradient(-45deg,#ccc 25%,#0000 25%),linear-gradient(45deg,#0000 75%,#ccc 75%),linear-gradient(-45deg,#0000 75%,#ccc 75%);background-position:0 0,0 4px,4px -4px,-4px 0;background-size:8px 8px}