a mesh-like grid in css

mesh.css

:root {
  --grid-color: rgba(100, 180, 120, .2)
}
html {
	position:relative;
}
html:after {
  position: absolute;
  width: auto;
  height: auto;
  z-index: 9999;
  content: '';
  display: block;
  pointer-events: none;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: transparent;
  background-image: linear-gradient(var(--grid-color) 1px, transparent 1px);
  background-size: 100% 16px;
}
html:before {
  position: absolute;
  width: auto;
  height: auto;
  z-index: 9999;
  content: '';
  display: block;
  pointer-events: none;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: transparent;
  background-image: linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 16px 100%;
}