How can we make appscript webapp compatible with mobile browser

I have a webapp created through appscript, and it works perfectly fine on both Desktop and Mobile browsers but when I open it in mobile browser font is quiet small and it is not compatible with difference device.

I have added this, but it is not working i guess :

<meta name="viewport" content="width=device-width, initial-scale=1.0">

Thanks

>Solution :

If you haven’t try adding these MetaTags to your doGet function:

.addMetaTag('viewport', 'width=device-width, initial-scale=1');

Reference:

HtmlOutputMetaTag