How to create LaunchImage for iPhone with the same image in HTML?

Question

User interface

There is a hybrid application written in Cordova for iOS. When loading an application, there is an iOS preloader that cannot be animated, and there is also a desire to make an animated preloader. The preloader looks like an icon and animation runs around it. It would be desirable that when the application is opened, an icon is shown (application preloader) and then animation starts (preloader from the site). How to make the icon from the site and the icon from the application the same size? For example, a 180px icon on a website looks like this

spoiler

the 180px icon for the ios preloader looks like this

spoiler

How to convert these sizes so that the icons in the two cases are the same?