:root{color-scheme:light dark;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}body{margin:0;background:var(--tg-theme-bg-color, Canvas);color:var(--tg-theme-text-color, CanvasText)}.screen{box-sizing:border-box;display:flex;align-items:center;justify-content:center;min-height:100vh;padding:16px;text-align:center}h1{margin:0;font-size:24px}