You can customize the “Content Slider” wrapper using the Combo Blocks plugin. This article will help you to customize the Content Slider Wrapper.
To begin, insert a “Content Slider” block.
Then choose a variation. For example, I choose the preset- 2 variation.
Now click on the Content Slider wrapper tab, then click on the Style tab.
Here add some style to customize the wrapper. Read this document if you don’t know how to style an element.