Add gray-1-20pct

Author: hojberg

src/css/ui/colors.css

@@ -12,6 +12,7 @@
   --color-gray-0-20pct: rgba(24, 24, 28, 0.2);
   --color-gray-0-50pct: rgba(24, 24, 28, 0.5);
   --color-gray-1-transparent: rgba(45, 46, 53, 0);
+  --color-gray-1-20pct: rgba(45, 46, 53, 0.2);
   --color-gray-2-transparent: rgba(65, 66, 75, 0);
   --color-gray-11-50pct: rgba(255, 255, 255, 0.5);
   --color-gray-10-50pct: rgba(250, 250, 251, 0.5);