window.innerWidth: (include scrollbar)
document.documentElement.clientWidth:
document.body.clientWidth: (not include scrollbar)
show this element when window.innerWidth >= 640
Because tailwind use default box-sizing:border-box; not content-box, So width, padding and border are mixed



relative div
overflow-x-auto div with textXl
absolute div

Left-0
Right-0
bottom-0
bottom-0 Right-0

Left-0
Right-0
bottom-0
bottom-0 Right-0