I'd like to set a static theme. In particular the material.
I saved the themes file css in a folder and added the following link to the index.html file:
DomHelper.setTheme() is for changing themes dynamically, if you want a static theme there is no need to use it. You only need to include the themes css as you seem to be doing already.
There is nothing special with the file, it is plain CSS. Just having it included on page is enough. Try and verify that the path is correct on the Network tab in devtools?
I checked all my application but I can't find where the theme is already set.
Do you know if there is another way to set the theme other to use the link in html.index?