#root{margin:0 auto;text-align:center;flex-grow:1}.container{background-image:linear-gradient(#fff,#b4b6b8)}body{padding:0;margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh;background-image:linear-gradient(#fff 50%,#b4b6b8 50%,#b4b6b8)}