Changing Styles Dynamically

const styles = window.getComputedStyle(element);
console.log(styles.getPropertyValue('background-color'));

getStyle()
getPropertyValue()
The getPropertyValue() method is used to retrieve the value of a specific CSS property from a CSSStyleDeclaration object. When used with getComputedStyle, it returns the final computed value of the property. This method expects the CSS property name in hyphenated format and returns the value as a string, including its units where applicable.
getValue()
getComputedProperty()