html,
body,
#tianditu-map {
    width: 100%;
    height: 100%;
    margin: 0;
    overflow: hidden;
    background: #0a121a;
}

#map-fallback {
    position: absolute;
    inset: 0;
    align-items: center;
    justify-content: center;
    color: #dbeafe;
    background: #0a121a;
    font: 14px/1.5 system-ui, sans-serif;
}

#map-fallback.is-visible {
    display: flex;
}