fix undefined primary color

Author: nemanjam

docs/working-notes/todo3.md

@@ -537,5 +537,6 @@ paralelizuj docker arm x86 build, reuse cache, test
 accessibility
 image sizes
 astro gallery, blur onload, infinite scroll
+define real color themes
 ------------
 ```

src/styles/theme/variables.css

@@ -20,6 +20,7 @@
     --var-color-blue-700: theme('colors.blue.700');
     --var-color-blue-100: theme('colors.blue.100');
     --var-color-blue-200: theme('colors.blue.200');
+    --var-color-blue-300: theme('colors.blue.300');
     --var-color-purple-700: theme('colors.purple.700');
     --var-color-purple-500: theme('colors.purple.500');
     --var-color-orange-400: theme('colors.orange.400');