How to add Nightmode Function in Webviewr App

Hello Kodular Experts!
I have a web view app and i want to add night mode in my app i added night mode but it only change apps theme from light to night i didn’t work on webview i used browser app when dark mode is enabled on my mobile in other browser this my websites theme changes but in kodular it is not being changed so please tell me Solution.

Use JS evaluate block with = "black"; = "white";