body {
  text-align: center;
  font-family: Arial, sans-serif;
  margin-top: 30px;
}

#grid-container {
  display: grid;
  grid-template-columns: repeat(20, 20px); /* 20x20 grid */
  grid-gap: 1px;
  justify-content: center;
}

.cell {
  width: 20px;
  height: 20px;
  background-color: #eee;
  border: 1px solid #ccc;
  cursor: pointer;
}

.cell.alive {
  background-color: black;
}

button {
  margin-top: 20px;
  padding: 10px;
  background-color: #4CAF50;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background-color: #45a049;
}