وحدة:Portal/styles.css

@media screen {
    html.skin-theme-clientpref-night .portalbox {
      background: transparent;
	}
}
/* forced night mode */
@media screen and (prefers-color-scheme: dark) {
    /* automatic mode */
    html.skin-theme-clientpref-os .pane {
      background: transparent;
    }
}