By changing the styling in Studio Pro. And this can get done, while being up-and-running locally so you immediately see your changes getting implemented. Kind of awesome.
Here is how:
Go to the ‘App Explorer’-pane (usually the left column in your StudioPro),
then to ‘Styling’,
then to ‘Web’,
open file ‘custom-variables.sscc’ and go to line 223:
Make any change, save it, and check you app to see what it now looks like.
But I have an another question how do I make thes types of containers?