body {
    font-family: 'Courier New', Courier, monospace;
    display: flex;
    justify-content: center;
    padding-top: 50px;
    background-color: #e9ecef;
}

.container {
    background: #ffffff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
    width: 300px;
}

input {
    padding: 8px;
    width: 60px;
    border: 1px solid #ccc;
    border-radius: 4px;
    margin-bottom: 15px;
}

button {
    background-color: #28a745;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
}

button:hover {
    background-color: #218838;
}

.output-area {
    margin-top: 20px;
    background: #222;
    color: #00ff00; /* Classic "hacker" green */
    padding: 20px;
    border-radius: 5px;
    min-height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
}

pre {
    margin: 0;
    font-size: 1.2rem;
    line-height: 1.2;
}