提示词：生成 html，内容是 svg 绘制鹈鹕骑自行车 2D 动画 
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源码： 





鹈鹕骑自行车 · SVG 2D 动画

  html, body { height: 100%; margin: 0; }
  body {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 16px; padding: 24px; box-sizing: border-box;
    background: radial-gradient(circle at 50% -10%, #1d3149 0%, #0d1520 55%, #070a10 100%);
    font-family: system-ui, -apple-sys...