html, body { height: 100%; margin: 0; }
body { display: flex; flex-direction: column; font-family: sans-serif; }
header { display: flex; justify-content: space-between; padding: 0.4rem 1rem; font-size: 0.9rem; }
#dashboard { flex: 1; min-height: 0; }
#dashboard iframe { width: 100%; height: 100%; border: 0; }