body{margin:0;padding:0;height:100vh;background:linear-gradient(-45deg,#c21818,#fc5546,#2e2e2e,#444);background-size:400% 400%;animation:gradientBG 10s ease infinite;font-family:Arial,sans-serif;display:flex;justify-content:center;align-items:center}@keyframes gradientBG{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.board{box-shadow:0 0 20px #ff4d4db3,0 0 40px #ff4d4d80,0 0 60px #ff00004d;transition:box-shadow .3s ease}.board:hover{box-shadow:0 0 25px #ff4d4de6,0 0 50px #ff4d4db3,0 0 70px #ff000080}