.linegrid {
background-size: 40px 40px;
background-image:
linear-gradient(to right, grey 1px, transparent 1px),
linear-gradient(to bottom, grey 1px, transparent 1px);
}
.dotgrid {
background-size: 40px 40px;
background-image: radial-gradient(circle, #000000 1px, white 1px);
}