body {
  background-color: #f8f8f8;
  font-family: Arial, sans-serif;
}

h1 {
  text-align: center;
  margin-top: 50px;
}

.bingo-card {
  width: 600px;
  height: 600px;
  margin: 0 auto;
  background-color: white;
  border: 1px solid #ccc;
  display: flex;
  flex-wrap: wrap;
}

.bingo-card > div {
  width: calc(100% / 5);
  height: calc(100% / 5);
  box-sizing: border-box;
  border: 1px solid #ccc;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 32px;
  font-weight: bold;
}

.buttons {
  display: flex;
  justify-content: center;
  margin-top: 20px;
}

button {
  padding: 10px 20px;
  font-size: 20px;
  font-weight: bold;
  border: none;
  background-color: #4caf50;
  color: white;
  cursor: pointer;
  margin: 0 10px;
}