APEX 5.1.2
Oracle 12c
I am using "Report Template template: 42. Cards" which is a very nice feature of APEX 5, and for Style of Cards I am using Compact. I'm not sure why my users are so annoyed with the randomly generated colors displayed at the top of the cards, as I personally find them visually appealing. However, it came back at the very top of the upcoming priority list for these cards to have one consistent color. Per the attached image the blue line at the top is what I am trying to change for all cards to the same color.

When I inspect the blue line on this particular card I get the following:
<span class="t-Card-colorFill u-color #CARD_COLOR#"></span>
Any help on changing all cards to have the same color at the top would be greatly appreciated.