.cell{transition:box-shadow .2s}.cell:not(.taken):not(.game-over):hover{box-shadow:0 0 0 2px #38bdf8}.mark-x{color:#38bdf8}.mark-o{color:#f472b6}.win-cell{animation:winPulse .6s ease-in-out 3}@keyframes winPulse{0%,to{box-shadow:0 0 0 0 transparent}50%{box-shadow:0 0 20px 6px rgba(34,197,94,.5)}}