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I have some components which use the mat-tab elements in the HTML. When trying to style these elements in the CSS, I am only able to style them using ::ng-deep .mat-tab-label {} for example, and putting !important next to at least one of the style changes. I do not want to leave this in the application long-term, especially after reading this article.

Here is how it breaks down looking at the elements in developer tools:

In my page, there is 2 mat-tab element. One is for parent, and one is for child.

I am trying to click the tab in my child tab, but when protractor runs, it failed because it always goes to the parent first thus failed to locate the child tab. Both having same css aside from the label.

This is how i done it previously. Previously there is no parent tab, thus it is working:

I've tried a number of ways to call the mat-tab and mat-ink-bar in my CSS. I have something like this HTML, for example: