Inorder to avoid redundancy in CSS code in an Angular App among the various parent child components, what solution is possible?

Question

I am working on an Angular application that has multiple parent and child components. Now from the point of view of code optimization and performance, in parent and child CSS files many classes and other CSS attributes are redundant. I require suggestions through which this code redundancy can be avoided in CSS files across different components and code reusability in CSS files can be established.