Added PWA support

app/styles/global.scss

@@ -1,11 +1,17 @@
 @use "reset" as *;
 @use "util" as *;
+@use "variables" as *;
 
 html {
 	font-family:
 		-apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
 		sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
 	color: white;
+	background-color: $color-background;
+}
+
+body {
+	background-color: $color-background;
 }
 
 main > h1 {