So I was tinkering around with the cards in the course catalog trying to find a slightly different look and found that the CSS adjustment was not real drastic. I thought some others may be interested in this small adjustment.
Here was the starting point.
You’ll notice I had chosen an image and used the Localization Tool to change the wording on the bottom already.
I was looking to pull out the icons on the bottom as well.

Here is the after

I got the icon out but then the text needed a small padding adjustment.
Then I wanted to try changing some colors on the bottom for the background and text color.
Here is the code for the above changes.
/** Make padding adjustment and background color change for catalog cards **/
ui-card-footer {
padding-left: 5px;
background-color: #000000;
}
/** Remove icons from bottom of course catalog cards **/
ui-card-footer ui-icon {
display: none;
}
/** Change text color for bottom of catalog cards **/
ui-card-footer span {
color: white;
}
Hopefully this helps someone out someday.