I would create a theme …

I would create a theme for it. I have mine in assets/themes/my-theme. It might be an overkill, but your styles might grow, so you are already prepared for it. I am changing a lot of things in my project and i am gonna setup my styles like angular material example does. With one click you can change themes very easily. https://material.angular.io/ See top bar the paint icon. Angular Material

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