How to change the text input line color with CSS

Hi, sorry to post again, I'm trying to change the text input line color to match the background but can't seem to find a way to do so.

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I've been testing around with these css styles but can't seem to work but the line changes to black after clicking on it.
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Nvm I've found out how to solve that, sorry for the trouble. I've basically added another line to highlight it.

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