include css in class scanning

Author: KianNH

src/styles/tailwind.css

@@ -4,7 +4,7 @@
 @import "tailwindcss/theme.css" layer(theme) source(none);
 @import "tailwindcss/utilities.css" layer(utilities) source(none);
 
-@source "../**/*.{astro,html,js,jsx,ts,tsx}";
+@source "../**/*.{astro,html,js,jsx,ts,tsx,css}";
 @source not "../content/";
 
 @theme {