W3School TIY Editor
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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> .block { display: block; width: 100%; border: none; background-color: #04AA6D; color: white; padding: 14px 28px; font-size: 16px; cursor: pointer; text-align: center; } .block:hover { background-color: #ddd; color: black; } </style> </head> <body> <h2>全宽按钮</h2> <button class="block">块级按钮</button> </body> </html>