Add command palette colours (#494)

Author: janfaracik

src/main/frontend/main.scss

@@ -42,6 +42,18 @@
   /* Breadcrumbs */
   --breadcrumbs-bar-background: hsl(240, 6%, 9%, 0.8);
 
+  /* Command Palette */
+  --command-palette-results-backdrop-filter: contrast(0.95) brightness(1.3) saturate(2) blur(30px);
+  --command-palette-inset-shadow: inset 0 0 0 1px hsla(250, 10%, 90%, 0.035);
+
+  ::backdrop {
+    --command-palette-backdrop-background: radial-gradient(
+        farthest-corner at 50% 30vh,
+        rgba(0, 0, 0, 0.6),
+        rgba(0, 0, 0, 0.5)
+    );
+  }
+
   /* Tooltips */
   --tooltip-background: hsl(240, 6%, 23%);
   --tooltip-backdrop-filter: contrast(0.6) saturate(4) brightness(0.4) blur(15px);