body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
}

.container {
    text-align: center;
}

.stack-container {
    margin: 20px auto;
    width: 200px;
    height: 300px;
    border: 2px solid #000;
    display: flex;
    flex-direction: column-reverse;
    align-items: center;
    justify-content: flex-start;
    overflow: hidden;
}

.stack-item {
    width: 180px;
    height: 30px;
    margin: 5px 0;
    background-color: #007bff;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 4px;
}

.controls {
    margin-top: 20px;
}

button {
    margin: 5px;
    padding: 10px 15px;
    font-size: 16px;
    border: none;
    border-radius: 4px;
    background-color: #007bff;
    color: #fff;
    cursor: pointer;
}
button a{
    text-decoration: none;
    font-size: 16px;
    color:#fff;
}

button:hover {
    background-color: #0056b3;
}

input {
    padding: 10px;
    font-size: 16px;
    border: 2px solid #007bff;
    border-radius: 4px;
}