body { font-family: sans-serif; background: #f5f5f7; margin: 0; }
.error { max-width: 600px; margin: 64px auto; padding: 24px; background: #fff; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,.1); }
.error h1 { color: #c00; margin-top: 0; }