.knight,.tutorial-knight{background-image:var(--knight-image-url)}.board-wrapper{width:100%;max-width:500px;margin:0 auto}.board{width:100%}.cell.hint-pulse{box-shadow:0 0 20px var(--secondary);animation:hintPulse 1s infinite alternate}@keyframes hintPulse{0%{box-shadow:0 0 15px var(--secondary)}to{box-shadow:0 0 25px var(--secondary)}}