Making my app browser friendly

Just finished making an app with ionic 2, but the dimensions of all the elements in the app are catered to a mobile phone. Since I want to launch a PWA version of the app and make it usable on laptops/desktops, what would be the best way to quickly make the app ‘dimensionally’ viewable and correct for a desktop browser? Should I add some media queries to app.scss? I’m open to any suggestions/useful tips.