AppShed apps are of course made for mobile devices with narrow screens but if you do use your web app on a desktop the following code will help make it look a bit nicer and avoid any stretching.

• Open your App in the App Builder
• Click Settings
• Click Advanced
• In the Custom JavaScript text box paste the code bellow
• Click Save
• Click Publish
• Click Share
• Click Web App

The code:

// When each screen loads
app.phone.addEvent('screen', function (id, el) {

// set up position of the main div
jQuery('.items').css('max-width', '380px').css('margin', 'auto');
jQuery('.screen').css('background-color', 'rgb(255,255,255)'); // the colour of the background

});

This code will not change the way your app is displayed on mobile devices, only on desktops/widescreens.