The most frustrating things to get right via CSS only are the micro animations. Because I cannot do them using any files, I have to kinda faux-replace them via CSS by using pseudos, base64 and hacks and animating those. Also because the element size will change depending whether it has a number or not, it's difficult to keep it in place.
This is why I have disabled the boost animation for now. The heart and star animations are staying in place, because they either have less numbers on instances that have numbers or no number at all.