To make grids you can use CSS gradients, which work on all modern browsers (see Caniuse).
Use linear gradients to draw a lined grid:
body {
background-size: 40px 40px;
background-image:
linear-gradient(to right, grey 1px, transparent 1px),
linear-gradient(to bottom, grey 1px, transparent 1px);
}Use a radial gradient to draw a grid with dotted corners:
body {
background-size: 40px 40px;
background-image: radial-gradient(circle, #000000 1px, rgba(0, 0, 0, 0) 1px);
}