dark mode in ionic5

 darkmode() {

const prefersColor = window.matchMedia('(prefers-color-scheme: dark)');

this.dark = prefersColor.matches;

this.updateDarkMode();

prefersColor.addEventListener(

'change',

mediaQuery => {

this.dark = mediaQuery.matches;

this.updateDarkMode();

}

);

}

updateDarkMode() {

this.dark = true;

// alert("data")

document.body.classList.toggle('dark', this.dark);

}

add functions in ngoninit of app.component.ts