crystal background css
.crystal {
background: linear-gradient(45deg, rgba(120, 120, 250, 0.5) 10%, transparent 10%),
linear-gradient(65deg, transparent 70%, rgba(120, 120, 250, 0.5) 70%),
linear-gradient(15deg, rgba(120, 120, 250, 0.5) 80%, transparent 80%),
linear-gradient(25deg, rgba(120, 120, 250, 0.5) 30%, transparent 30%),
linear-gradient(-35deg, rgba(120, 120, 250, 0.5) 50%, transparent 50%),
rgba(120, 120, 250, 0.5);
}