.msu-board {
  display: grid;
  gap: 2px;
  margin: 14px auto;
  width: max-content;
  background: #1b2138;
  padding: 8px;
  border-radius: 12px;
}
.msu-cell {
  width: 52px;
  height: 52px;
  background: #2b3354;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  cursor: pointer;
  user-select: none;
}
.msu-cell.br { margin-right: 6px; }
.msu-cell.bb { margin-bottom: 6px; }