Add and use postcss-import

resources/css/custom-base.css

@@ -0,0 +1,27 @@
+h1, h2, h3 {
+  @apply font-bold
+}
+
+h1 {
+  @apply text-3xl
+}
+
+h2 {
+  @apply text-2xl
+}
+
+img {
+  @apply max-w-full h-auto
+}
+
+a {
+  @apply text-blue-600 no-underline;
+
+  &:hover {
+    @apply underline
+  }
+}
+
+blockquote {
+  @apply border-l-4 border-blue-600 pl-4 px-6 py-2
+}