ReactJS with React Router solution for Space Tourism Website

I created the Space Tourism website in React with React Router library. Please let me know if you have some comments.

[Question] I noticed that I could not style the <NavLink> component using CSS modules through classnames. The solution I did was to check how the component resolves into the DOM. It turns into an <a> tag.
Then I accessed the CSS class of the parent and select the <a> tag like this: .navSecondaryContainer a {

Also I have observed that I could not style the children of the <NavLink> component. In one instance I had a button that was wrapped in the <NavLink> tag and the only way I could style was doing this selector: .navButtonContainer a > button {

Please let me know if there is an easier way. Thanks.