… sufficient size. What is sufficient? Different people (companies) will give you different answers. Apple suggests that the ideal “touchable” area should be 44px. Microsoft says it’s 34px. Based on my experience, good rule of thumb is to use 48px, or 3 rem (if font-size set for HTML or body is 16px). It is also good idea to use at least 6px for creating some space around the element to prevent people touch the wrong element.