fix: font fallback issue

#1556

src/routes/auth/+page.svelte

@@ -215,6 +215,8 @@
 
 <style>
 	.font-mona {
-		font-family: 'Mona Sans';
+		font-family: 'Mona Sans', -apple-system, 'Arimo', ui-sans-serif, system-ui, 'Segoe UI', Roboto,
+			Ubuntu, Cantarell, 'Noto Sans', sans-serif, 'Helvetica Neue', Arial, 'Apple Color Emoji',
+			'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
 	}
 </style>