fix: Close button for slider in Origine theme (#4842)

p/themes/Origine/origine.css

@@ -1132,7 +1132,8 @@ a:hover .icon {
 
 	.aside .toggle_aside,
 	#panel .close,
-	.dropdown-menu .toggle_aside {
+	.dropdown-menu .toggle_aside,
+	#slider .toggle_aside {
 		background-color: var(--background-color-light-shadowed);
 		border-bottom: 1px solid var(--border-color);
 	}

p/themes/Origine/origine.rtl.css

@@ -1132,7 +1132,8 @@ a:hover .icon {
 
 	.aside .toggle_aside,
 	#panel .close,
-	.dropdown-menu .toggle_aside {
+	.dropdown-menu .toggle_aside,
+	#slider .toggle_aside {
 		background-color: var(--background-color-light-shadowed);
 		border-bottom: 1px solid var(--border-color);
 	}