官方

https://github.com/stevenjoezhang/canvas-matrix.js

代码

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{% raw %}
<style>
#footer {
  background: 0;
}
#page-header {
  background-color: transparent;
}
[data-theme="light"] body {
  background: #0d0d0d;
}
[data-theme="dark"] #footer:before {
  background-color: transparent;
}
</style>
<script async src="https://cdn.jsdelivr.net/npm/canvas-matrix.js@0/canvas-matrix.min.js" size="20" font="arial"></script>
{% endraw %}

效果