“Хрустальный фон CSS” Ответ

Хрустальный фон 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);
}