You shouldn’t have to do that to “fix” it though. Here’s I found the CSS stuff that you can you to manually put in at the bottom of the CSS file:
.workspace-tab-header-inner-icon {
color: #fcf601
}
.workspace-tab-header-inner-icon:hover {
color: #3DD87F
}
Note: Change the colors to your liking of course!
That’s a short-term fix for you. I will probably tinker with the main version soon.