main{max-width:900px;margin:20px auto;padding:22px;border:1px solid #c6d3cb;border-radius:8px}h1{font-size:26px}h2{font-size:18px}article{padding:10px 0}article p{margin:8px 0;font-size:14px}.notice{padding:9px 12px}.actions{gap:10px;font-size:14px}.actions a{padding:5px 8px;border:1px solid #ccd7d0;border-radius:5px}header{padding:12px max(16px,calc((100% - 900px)/2))}@media(max-width:650px){main{margin:8px;padding:15px}}