html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
    /* Same neutral surface as the Compose theme's background, so resizing never flashes white/black. */
    background: #fef7ff;
}

@media (prefers-color-scheme: dark) {
    html, body {
        background: #141218;
    }
}