fix: update background color of language switcher (#1314)

Author: Robot-Inventor

src/css/style.css

@@ -81,15 +81,10 @@ header img {
 #language_switcher-select {
     font-size: inherit;
     color: inherit;
-    background: none;
+    background: #070c14;
     border: none;
 }
 
-#language_switcher-select > option {
-    color: inherit;
-    background: #202229;
-}
-
 #top_section {
     height: calc(100vh - var(--header-height));
     padding: 3rem;