:root{--vh:100vh}*{box-sizing:border-box;margin:0;padding:0}html,body{overscroll-behavior:none;background:linear-gradient(red,#00f);width:100%;height:100%;position:fixed;overflow:hidden}.app-container{-webkit-overflow-scrolling:touch;color:#fff;flex-direction:column;justify-content:center;align-items:center;width:100%;height:100%;display:flex;overflow-y:auto}