#app{height:100vh;width:100%;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:#f5f5f5}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;width:100%;overflow-x:hidden}#app{height:100%;width:100%}.brd{outline:1px solid red}