body{font-family:Arial,'Microsoft YaHei',sans-serif;background:#f5f7fb;margin:0;color:#333}
header{background:#005bbb;color:#fff;padding:40px;text-align:center}
main{max-width:900px;margin:30px auto;background:#fff;padding:30px;border-radius:10px;box-shadow:0 2px 8px rgba(0,0,0,.1)}
h2{color:#005bbb}
footer{text-align:center;margin-top:40px;color:#777}