If I understand correctly, the * .css files will be overwritten after updates, including those original * .css files that have been edited.
My suggestion, the option to be able to create your own css file, which is not overwritten by updates and is taken into account in the styles.
i.e. load the original * .css into the style and then your own * .css
Here it should also be possible to enter your own "file * .css" in the style settings ...
It can no longer happen that your own changes in the * .css files are overwritten during the update.
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