デフォルトのcheckboxはdisplay: none;で隠しつつ、::beforeで四角の枠を、::afterでチェックマークを付けていきます。 radioの場合はborder-radius: 50%; で円を作れば良さそうですね。

CSS hidden accessibility for screen readers is not compatible with the NVDA/Firefox screen reader/browser combination. The issue arises due to Firefox's interpretation of the transform: scale(0); ...

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Pseudo elements are useful for changing the background colour of the checkbox and radio buttons. We can use :before and :after to change the colour or appearance of the checkboxes. It can all work ...