:doodle { @grid: 21 / 100vmax; background: #0a0c27; } @random { border-top: 2px solid #60569e; } @random { border-left: 2px solid #60569e; } @random(.1) { :after { content: ''; background: hsl(@rand(360), 60%, 70%); border-radius: 10px; @size: 10px; } }