I recently implemented a toggle-class feature with Bootstrap glyph icons, but I seem to have encountered an issue with my CSS file. Despite trying to figure out where the mistake lies, I can't seem to pinpoint it. The problem is that in this example, the toggle-class functions correctly as the arrow icons move up and down appropriately when clicked. However, on the webpage I am currently working on (see here), the same functionality doesn't work as expected, resulting in a strange movement of the arrow icon upon clicking. I've meticulously checked my files, but I can't identify the root cause. What could be causing this discrepancy? Is there something crucial missing from my page?