Bug 100vh on iOS
Referral link: https://nicolas-hoizey.com/2015/02/viewport-height-is-taller-than-the-visible-part-of-the-document-in-some-mobile-browsers.html On iOS, when user set 100vh CSS, it not work right, a scrollbar appear. And Apple won't fix it. " This is completely intentional. It took quite a bit of work on our part to achieve this effect. "