<style>
  css-doodle {
    --color: @p(#51eaea, #fffde1, #ff9d76, #FB3569);
    --rule: (
      :doodle {
        @grid: 30x1 / 18vmin;
        --deg: @p(-180deg, 180deg);
      }
      :container {
        perspective: 30vmin;
      }
      :after, :before {
        content: '';
        background: var(--color); 
        @place-cell: @r(100%) @r(100%);
        @size: @r(6px);
        @shape: heart;
      }
    
      @place-cell: center;
      @size: 100%;
    
      box-shadow: @m2(0 0 50px var(--color));
      background: @m100(
        radial-gradient(var(--color) 50%, transparent 0) 
        @r(-20%, 120%) @r(-20%, 100%) / 1px 1px
        no-repeat
      );
    
      will-change: transform, opacity;
      animation: scale-up 12s linear infinite;
      animation-delay: calc(-12s / @I * @i);

      @keyframes scale-up {
        0%, 95.01%, 100% {
          transform: translateZ(0) rotate(0);
          opacity: 0;
        }
        10% { 
          opacity: 1; 
        }
        95% {
          transform: 
            translateZ(35vmin) rotateZ(@var(--deg));
        }
      }
    )
  }
</style>
<css-doodle use="var(--rule)"></css-doodle>