body {
  font-family: 'Comic Sans MS', cursive, sans-serif;
  background: #8b8b8b;
  text-align: center;
  padding: 20px;
}
h1 {
  color: #333;
}
.info-box {
  margin: 20px auto;
  padding: 10px;
  background-color: #fffbe6;
  border: 2px solid #ffe066;
  border-radius: 10px;
  width: fit-content;
}
.table {
  display: grid;
  grid-template-columns: repeat(18, 60px);
  grid-auto-rows: 60px;
  gap: 6px;
  justify-content: center;
  margin-top: 20px;
  background: #d2d2d2;
  border: 3px solid #000;
  padding: 1.0em;
  border-radius: 1.0em;
}
.element {
  background: #fff;
  border-radius: 8px;
  border: 2px solid #ccc;
  padding: 4px;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s;
}
.element:hover {
  transform: scale(1.05);
  border-color: #999;
}
.symbol {
  font-size: 18px;
}
.number {
  font-size: 12px;
}
.group-1 { background-color: #ffb3ba; }
.group-2 { background-color: #ffdfba; }
.group-3 { background-color: #ffffba; }
.group-13 { background-color: #baffc9; }
.group-14 { background-color: #bae1ff; }
.group-15 { background-color: #d5baff; }
.group-16 { background-color: #ffc9de; }
.group-17 { background-color: #c9ffff; }
.group-18 { background-color: #e6ccff; }