Better fix

Shogi.UI/Layout/MainLayout.razor.css

@@ -1,6 +1,12 @@
 .MainLayout {
 	display: grid;
 	grid-template-columns: auto 1fr;
+	grid-template-rows: 100vh;
 	place-items: stretch;
-	height: 100vh;
-}
+}
+
+@media all and (max-width: 600px) {
+	.MainLayout {
+		grid-template-columns: min-content max-content;
+	}
+}