Like this ↑
This could make it a bit easier to distinguish in-faction cards at a glance using more than just their name - plus as a new deckbuilder I tend to check card costs quite a lot.

If you want to use that CSS, it's

  margin: 0px 4px;
  display: inline-flex;
  border-radius: 8px;
  width: 16px;
  height: 16px;
  background: #000;
  border: 1px solid rgb(203, 173, 7);
  justify-content: center;
  align-items: center;
  font-weight:bold;

Similar CSS can be made for rez costs by removing the border and replacing the background with

background: radial-gradient(black, transparent 80%);