How put out dynamic insertion

Hi @sashic

The theme uses Javascript code to create the <style> tag to apply the settings in Customizer (colors, typography, margin, …)

You can follow here https://github.com/PressMaximum/customify/blob/master/assets/js/customizer/auto-css.js#L191-L193

If you want to create a file and write the code to the file, this link maybe help you to do that with some custom code
https://stacktips.com/tutorials/html5/reading-and-creating-text-files-using-jquery-and-html5-file-api

Regards.