Add animations

src/lib/islands/overlay-island.svelte

@@ -1,8 +1,10 @@
 <script>
+	import { fade } from "svelte/transition";
+
     export let variables = {title:""}
 </script>
 
-<div>
+<div in:fade={{duration: 150}} out:fade={{duration: 150}}>
     <span>{variables.title}</span>
     <slot />
 </div>