Add custom base style of Tailwind

src/layouts/Layout.astro

@@ -1,4 +1,6 @@
 ---
+import "../styles/base.css";
+
 export interface Props {
   title: string;
 }

src/styles/base.css

@@ -0,0 +1,9 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@layer components {
+  .btn-blue {
+    @apply bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded;
+  }
+}