Different images for desktop, tablet, mobile, notebook

Hi @panconpescao!

In the Free version, we do not have these features available, and due to the forum guidelines we cannot talk about commercial products here, including the Pro version, but if you are interested, you can get in touch with us over the ticket system here:
https://smartslider3.com/contact-us/presale-questions/
and we can let you know about the options.

For the Free version, the best I could suggest is to make a desktop and mobile specific slider, and hide them on views they should not appear on:
https://smartslider.helpscoutdocs.com/article/1980-how-to-hide-the-slider-on-mobile

Hi, I tried the CSS you posted and it worked pretty well. I had one more question that I couldn’t find an answer anywhere.

How do I change the color of a button on a slider and also the font color when the cursor is over the button? a hover event

I am glad that worked!

As you see here:
https://smartslider.helpscoutdocs.com/article/1812-layer-style#hovernormal-and-other-special-states
There are different states for the layers. This is the case for the Button layer as well.
If you go to its style tab, next to “TYPOGRAPHY” AND “BACKGROUND” you will see a dropdown, which can be used to switch between the given states. You can switch to Hover, and changes you apply there will be shown on Hover.