#mb { background: linear-gradient(145deg, #7a5a3a, #5a3f27); }
#mb .cell { cursor: default; }
#mb .cell.go { cursor: pointer; }
#mb .pulse { animation: mpulse 1s ease-in-out infinite; }
.tools { flex-wrap: wrap; align-items: center; }
.walls { display: flex; gap: 3px; margin-top: 4px; flex-wrap: wrap; }
.walls i { width: 5px; height: 16px; border-radius: 2px; background: linear-gradient(180deg, #e8c28a, #b98a4e); box-shadow: 0 1px 1px rgba(0, 0, 0, 0.45); }
.walls i.o { background: transparent; box-shadow: inset 0 0 0 1.5px rgba(150, 150, 160, 0.45); }