If there's a focusable element inside the position fixed element, i.e. an input element, this can cause the entire fixed element to jump out of place. This will only happen if the user has scrolled any amount (but if you're using position:fixed you're expecting exactly that kind of usage).
Many Android and iOS apps have horizontal scrolling lists. Maybe it’s also combined inside a vertical list. But is it necessary? Even assuming it is, are you doing it right?
In this article, let’s discuss tips to remember when designing horizontal lists. Later, we’ll look at possible alternatives that can work better.