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<!DOCTYPE html> <html> <head> <style> body { font-family: sans-serif; padding: 20px; background: #f0f0f0; text-align: center; } h1 { color: #007acc; } .box { background: white; padding: 20px; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); } </style> </head> <body> <div class="box"> <h1>Hello World!</h1> <p>Edit the code tab to see changes live.</p> <button onclick="alert('It works!')">Click Me</button> </div> </body> </html>