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

button {
  padding: 10px 20px;
  margin: 5px;
  cursor: pointer;
}

.tab-content {
  display: none;           
  border: 1px solid #ccc;
  padding: 15px;
  margin-top: 10px;
}

.active {
  display: block;           
}