UI Builder. Styling underlying text input component (#unity-text-input)

I want to style inner component to make my input look better (match design) without background and with bottom border. Is there a way to style that guy?
5306799--533298--upload_2019-12-22_21-14-38.png
Currently I cannot change any styles of that node in ui builder, because each entry is disabled. I cannot also add custom css classes in it. What do you advice?

Yep, you can use USS selectors to change the styles of child elements. See this similar thread:

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