Add dark mode in react admin panel

Hi, i am implementing a bootstrap theme to my react admin panel which is having dark mode. I want to add this into my project with prefers-color-scheme (window.matchMedia) and not by toggling. I have 2 bootstrap css files (theme-light.css and theme-dark.css).

Can anyone help me or have an example that how can i implement the dark mode inside my react application ? I have googled and found below code, but it is not working as expected.

const [isDarkMode, setisDarkMode] = useState(false);
const [isLightMode, setisLightMode] = useState(false);
const [supportsColorScheme, setSupportsColorScheme] = useState(false);

useEffect(() => {
const supportsColorScheme = window.matchMedia(
"(prefers-color-scheme)"
).matches;

const isDarkMode = window.matchMedia(
  "(prefers-color-scheme: dark)"
).matches;

const isLightMode = window.matchMedia(
  "(prefers-color-scheme: light)"
).matches;

setisDarkMode(isDarkMode);
setisLightMode(isLightMode);
setSupportsColorScheme(supportsColorScheme);

}, []);

if (supportsColorScheme) {
if (isDarkMode) {
require("assets/css/theme-dark.css");
} else if (isLightMode) {
require("assets/css/theme-light.css");
}
}