@emccorson
It is just how you said it. Thank you a lot.
After importing a theme.css, I imported each component from components and it override onsen component style.

@emccorson thank You for replyed, it was helpful.
I downloaded a ‘theme.css’ from theme roller and imported it in project and everything working right now, but I have now something different to deal with, people with who I working on project gave me something like this (pictures down below).

How they told me, they created this files on ‘onsen theme roller’ but I don’t know how!?
As you can see, I have theme and also I have components, its different from what ‘theme roller’ generate for you. So, how I should import all of these components in my React project?

Thank You in advance.

@emccorson Can you give us a little more about this ‘import the downloaded files into your project’.
I mean, I know what this mean, but how we should do it?
Does it mean that we should do something with node moduls/onsenui/css-components-src and so on or something different.
Can you give us here a detail instructions how to do it. Thank you!

I was trying to apply dark theme on my react app and I tried with your
'yet-another'
example, but I don’t get it. I have my app, I can not run command like
'yarn run serve'
there so how I can apply dark theme or any other them (custom theme that I ‘created’ on you theme roller) ?!
I read a lot of articles about this topic, but I did not get any useful info from them. I did a deep research about this and nothing, still at the beginning.
So, if you have some advice, about that how to ‘include’ customize theme in my react app, just give me a comment.