body { font: 17px/1.6 system-ui, sans-serif; color: #172635; background: #f8fafc; margin: 0; }
main { max-width: 880px; padding: 36px 24px; margin: auto; }
a { color: #075f85; } li { margin-bottom: 28px; }
pre { overflow: auto; background: #eaf0f5; padding: 18px; font-size: 13px; }
button { background: #075f85; color: white; padding: 12px 18px; border: 0; border-radius: 5px; cursor: pointer; }
button:disabled { opacity: .5; } h1,h2 { line-height: 1.25; }