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<!DOCTYPE html> <html> <head> <style> select { width: 100%; padding: 16px 20px; border: none; border-radius: 4px; background-color: #f1f1f1; } </style> </head> <body> <p>样式化的选择菜单。</p> <form> <select id="country" name="country"> <option value="au">Australia</option> <option value="ca">Canada</option> <option value="usa">USA</option> </select> </form> </body> </html>