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<!DOCTYPE html> <html> <head> <style> ::file-selector-button { border: 2px solid black; padding: 5px 10px; border-radius: 5px; background-color: lightgreen; } ::file-selector-button:hover { background-color: salmon; cursor: pointer; } </style> </head> <body> <h1>::file-selector-button 演示</h1> <form> <label for="fileUpload">上传文件：</label> <input type="file" id="fileUpload" /> </form> </body> </html>