Here’s a bug where the solution is to delete CSS code. My team replaced the string in a UI element with a much longer string, and the longer string now extends past the bottom border of the element. In the giant CSS file (400+ lines, another problem for another time), I found this:

.custom-element {
  width: 100px;
  height: 20px;
  ...
}

Simply deleting the height rule fixed the problem. Now the browser takes care of setting the height of the element to fit its content, and the next time we make the string longer or shorter, the element height will be just right. The lesson is to avoid using fixed values where possible, because otherwise it needlessly constrains your UI and makes it brittle.