:root{
  --bg: #0f1115;
  --text: rgba(255,255,255,.92);
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}
*{ box-sizing: border-box; }
html, body{ height:100%; }
body{
  margin:0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
}