Change src to assets

wp-content/themes/twentynineteen-tailwindcss/assets/css/components/post.css

@@ -0,0 +1,37 @@
+.entry-title {
+  @apply text-black text-4xl font-bold mt-6 mb-8;
+
+  @screen md {
+    @apply text-5xl;
+  }
+}
+
+.entry-title a {
+  @apply text-inherit;
+
+  &:hover {
+    @apply text-gray-800 no-underline;
+  }
+}
+
+.entry-header,
+.entry-meta,
+.entry-footer {
+  @apply flex flex-wrap w-full;
+}
+
+.entry-footer {
+  @apply mt-8;
+}
+
+.byline,
+.posted-on,
+.cat-links,
+.comments-link,
+.edit-link {
+  @apply flex items-center mr-4 mb-2;
+
+  svg {
+    @apply mr-2 fill-current text-gray-600;
+  }
+}