adjust font, do not change the font on switching between portrait and landscape

deltachat-ios/Assets/Help/help.css

@@ -1,7 +1,8 @@
 body {
-    font-size: 14pt;
-    font-family: sans-serif;
+    font-size: 13pt;
+    font-family: -apple-system, sans-serif;
 	padding: 0 .5rem .5rem .5rem;
+    -webkit-text-size-adjust: none;
 }
 
 a {