body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
    text-align: center;
  }
  
  .container2 {
    width: 300px;
    margin: 50px auto;
  }
  
  #stackContainer {
    border: 2px solid #333;
    background-color: #fff;
    margin-top: 20px;
    padding: 10px;
    min-height: 300px;
    display: flex;
    flex-direction: column-reverse;
  }
  
  .stack-item {
    background-color: #007bff;
    color: white;
    padding: 10px;
    margin: 5px 0;
    border-radius: 4px;
  }
  
  button {
    margin: 10px 5px;
    padding: 10px 15px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
  
  button:hover {
    background-color: #0056b3;
  }
  
  input {
    padding: 10px;
    margin: 10px;
    border-radius: 5px;
    border: 2px solid #ccc;
  }