.signin-background{background:linear-gradient(-45deg,#1f2937,#374151,#4c1d95,#6366f1);background-size:400% 400%;animation:gradientShift 15s ease infinite}@keyframes gradientShift{0%{background-position:0 50%}50%{background-position:100% 50%}to{background-position:0 50%}}