body {
  font-family: Arial, sans-serif;
  margin: 20px;
  background: #f4f4f4;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
}

.grid {
  display: grid;
  grid-template-columns: 120px repeat(10, 1fr);
  gap: 2px;
}

.header {
  background: #333;
  color: white;
  padding: 5px;
  text-align: center;
  font-weight: bold;
}

.row-label {
  background: #ddd;
  padding: 5px;
  font-weight: bold;
}

.cell {
  background: #fff;
  border: 1px solid #ccc;
  height: 40px;
}

.cell.blue {
  background: #2196f3;
}