How to make category slider as a card/flat style
In the category slider, You will find an option called "Make it Card Style" in the Display Options tab. If you want to show all the content of your categories in a single Block like a card then you need to check this option.
By checking it, you will find a few more options to customize your category slider. There are several options which are explained below.
Border (px) – Sets border around the category contents. You can also adjust the border style, color, and hover color with this option.
Background – You can change the category content background color and hover color.
Inner Padding – Add padding between the category content and the border. You can set the padding in px or em format as per your need.
Screenshot - 1: (Settings configuration for card style category slider)
Screenshot - 2: (Card style category slider view)