body {
  font-family: Arial, sans-serif;
  text-align: center;
  background: #f5f5f5;
  margin: 0;
  padding: 20px;
}

.top-bar {
  display: flex;
  gap: 24px;
  justify-content: center;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.controls button,
#smileyBtn {
  padding: 6px 10px;
  cursor: pointer;
}

table.board {
  margin: 12px auto;
  border-collapse: collapse;
}

.board td {
  width: 32px;
  height: 32px;
  border: 1px solid #333;
  background: #cfcfcf;
  text-align: center;
  vertical-align: middle;
  user-select: none;
  cursor: pointer;
  font-weight: bold;
}

.board td.revealed {
  background: #e9e9e9;
  cursor: default;
}

.board td.mine { background: #f66 }
.board td.flag { background: #ffd966 }