Untitled

@grid: 1 / 100%;
@content: @pattern(
  p: pos * 5;
  v: sin(p.x + .6t) + sin(p.y * 1.3 - .6t) + sin(length(p) * 2 - .6t);
  k: .5 + .5 * sin(v * 1.4);
  fill: mix(
    mix(#111222, #000000, smoothstep(0, .5, k)),
    #111222, smoothstep(.5, 1, k)
  );
);