body{font-family:Arial,sans-serif;text-align:center;background:#f4f4f4;margin:0}header{background:#0078d4;color:#fff;padding:20px}main{margin-top:50px}button{background:#0078d4;color:#fff;border:none;padding:10px 20px;border-radius:5px;cursor:pointer}button:hover{background:#005a9e}