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<div
  style="display: flex;
            align-items: center;
            justify-content: center;
            height: 100%;
            background: -webkit-gradient(linear, 0% 0%, 0% 100%, color-stop(0%, rgba(242,243,244,1)),color-stop(100%, rgba(229,231,233,1)))"
>
  <iframe
    allow="microphone; camera; bluetooth; serial;"
    src="https://microblocksfun.cn/run/microblocks.html"
    style="width: 95%; height: 95%"
  >
  </iframe>
</div>