add custom 404

Author: frodesundby

src/routes/404/+page.svelte

@@ -0,0 +1,11 @@
+<img class="centered" src="logo404.png" alt=""/>
+<style>
+    .centered {
+    text-align: center;
+    position: absolute;
+    top: 20%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    width: 300px;
+}
+</style>

svelte.config.js

@@ -39,6 +39,7 @@ const config = {
 		adapter: adapter({
 			pages: "build",
 			assets: "build",
+			fallback: "404.html",
 		}),
 
 		alias: {