feat: simple dialog

src/App.css

@@ -71,3 +71,14 @@ button {
   background-color: black;
   border: 4px solid black;
 }
+
+::backdrop {
+  background-image: linear-gradient(
+    45deg,
+    magenta,
+    rebeccapurple,
+    dodgerblue,
+    green
+  );
+  opacity: 0.75;
+}