https://azukiazusa.dev/blog/shorts/3xubuPzazJ86RlN8Br7Lm3/
CSS でファイルのアップロードボタンをカスタマイズする ::file-selector-button...
file selector buttoncss
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https://developer.mozilla.org/de/docs/Web/CSS/Reference/Selectors/::file-selector-button
::file-selector-button - CSS | MDN
file selector buttoncss mdn