Adjust dynamic styles on the departure board component

src/routes/+layout.svelte

@@ -147,7 +147,7 @@
 	<h1 class="viewport-guard-title">Narrow Gauge Detected</h1>
 	<p>
 		Just as trains need the right track width, our data needs a bit more room to stay on the rails.
-		Please expand your view to at least 300px to view the app.
+		Please expand your view to at least 320px to view the app.
 	</p>
 </div>
 
@@ -319,7 +319,7 @@
 		display: none;
 	}
 
-	@media (max-width: 299px) {
+	@media (max-width: 319px) {
 		.viewport-guard {
 			display: block;
 			position: fixed;