@keyframes gradient-shift{0%{background-position:0%}50%{background-position:100%}to{background-position:0%}}body{margin:0;font-family:Comic Sans MS,cursive}.app-bg{background:linear-gradient(135deg,#f0c,#f60,#ff0,#0fc,#f06,#f0c) 0 0/400% 400%;justify-content:center;align-items:center;min-height:100vh;animation:8s infinite gradient-shift;display:flex}