How to change background color in iOS app on Phonegap?

Question

Mobile development

You need to change the background color in the iOS app to Phonegap.
It is black by default.
No settings in config.xml to at least hide the background by removing the bounce helped, namely these:

<preference name="DisallowOverscroll" value="true" />
  <preference name="webviewbounce" value="false" />
  <preference name="UIWebViewBounce" value="false" />

In the project, in css, background: #fff was prescribed for everything - it does not help.
How to be?