Custom CSS for rounding the corners of the card in a banner slideshow

Does anyone know how to custom code the corner radius of the text card in a banner slideshow? I've been looking everywhere and none of the code I've found or written seems to work. Pic attached for what I'm talking about. I have this same block type throughout my site and I need all of the cards to have rounded corners. THANK YOU!

37 minutes ago, EliseHK said:

Does anyone know how to custom code the corner radius of the text card in a banner slideshow? I've been looking everywhere and none of the code I've found or written seems to work. Pic attached for what I'm talking about. I have this same block type throughout my site and I need all of the cards to have rounded corners. THANK YOU!

Can you provide your URL so I can take a look?

@yogap thank you so much! 

What if you want to do the same rounded border but to the slideshow image instead of the background card? Thanks!

Found it! If anyone needs it and end up here:

section[data-section-id="66851c81cb561d2f10f00ca8"] .slide-media-container {
    border-radius: 30px;
}