html,body{margin:0}
#boot-shell{min-height:100vh;display:flex;align-items:center;justify-content:center;background:hsl(0 0% 98%)}
#boot-shell>div{width:64px;height:64px;border-radius:16px;background:hsl(152 60% 45% / .1);display:flex;align-items:center;justify-content:center;font-size:24px}
#root:not(:empty)+#boot-shell{display:none}