FIX:style_dark_mode_select_boxes

### UPD_Styles: Add dark mode styles for select elements and options.

Actually some select "boxes" have css dark theme support, but other not.
This PR add CSS for dark theme selects.

src/app.css

@@ -152,6 +152,16 @@ select {
 	-webkit-appearance: none;
 }
 
+.dark select {  
+	background-color: rgb(23, 23, 23); /* gray-900 */  
+	color: rgb(209, 213, 219); /* gray-300 */  
+}  
+
+.dark select option {  
+	background-color: rgb(38, 38, 38); /* gray-850 */  
+	color: rgb(255, 255, 255);  
+}
+
 @keyframes shimmer {
 	0% {
 		background-position: 200% 0;