:root{--brand-color: #3b82f6}html,body,#root{height:100%}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,Helvetica Neue,Arial,"Apple Color Emoji","Segoe UI Emoji";color:#111827;background:#f9fafb}.app{padding:2rem}h1{color:var(--brand-color)}