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chromium/third_party/blink/web_tests/fast/forms/color-scheme/file/file-appearance-basic.html 

<!DOCTYPE html>
<meta name="color-scheme" content="light dark">
<script src="../../resources/common.js"></script>
<body style="background-color: red">

<!-- no style for reference -->
<ul>
  <li>File: <input type="file" /></li>
</ul>

<!-- disabled -->
<ul>
  <li>File disabled: <input type="file" disabled/></li>
</ul>

<!-- zoom -->
<ul>
  <li>File zoom: 1.5: <input type="file" style="zoom: 1.5;"/></li>
  <li>File zoom: 4: <input type="file" style="zoom: 4;"/></li>
</ul>

</body>