*,:after,:before{box-sizing:border-box;margin:0;padding:0}body,html{height:100%}body{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#1a1a2e,#16213e 50%,#0f3460);font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}