How to make a grid (like graph paper grid) with just CSS? I just want to make a virtual grid paper only using CSS.
Since you mentioned lined paper:
div {
background-color: #fff;
background-size: 100% 1.2em;
background-image: -webkit-linear-gradient(0deg, transparent 79px, #abced4 79px, #abced4 81px, transparent 81px), -webkit-linear-gradient(#eee .05em, transparent .05em);
background-image: -moz-linear-gradient(0deg, transparent 79px, #abced4 79px, #abced4 81px, transparent 81px), -moz-linear-gradient(#eee .05em, transparent .05em);
background-image: -ms-linear-gradient(0deg, transparent 79px, #abced4 79px, #abced4 81px, transparent 81px), -ms-linear-gradient(#eee .05em, transparent .05em);
background-image: -o-linear-gradient(0deg, transparent 79px, #abced4 79px, #abced4 81px, transparent 81px), -o-linear-gradient(#eee .05em, transparent .05em);
background-image: linear-gradient(0deg, transparent 79px, #abced4 79px, #abced4 81px, transparent 81px), linear-gradient(#eee .05em, transparent .05em);
-pie-background: linear-gradient(0deg, transparent 79px, #abced4 79px, #abced4 81px, transparent 81px) 0 0 / 100% 1.2em, linear-gradient(#eee .05em, transparent .05em) 0 0 / 100% 1.2em #fff;
behavior: url(/PIE.htc);
}
<div style="width: 200px; height: 200px"></div>
The last line: behavior: url(/PIE.htc);
is a plugin called css3pie that adds support for ie 6-9 I believe. In fact this example is taken from their website where there are plenty more interesting examples: http://css3pie.com/demos/gradient-patterns/