.checkerboard-background {
    background-image: linear-gradient(45deg, rgba(192, 192, 192, 0.75) 25%, transparent 25%), linear-gradient(-45deg, rgba(192, 192, 192, 0.75) 25%, transparent 25%), linear-gradient(45deg, transparent 75%, rgba(192, 192, 192, 0.75) 75%), linear-gradient(-45deg, transparent 75%, rgba(192, 192, 192, 0.75) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}