feat: 404 page

src/pages/404.module.scss

@@ -0,0 +1,9 @@
+@reference "../index.scss";
+
+#container {
+  @apply flex h-screen w-full flex-col items-center justify-center;
+}
+
+#main_container {
+  @apply flex flex-col items-center gap-8;
+}