body {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f4f4f9;
}

.container {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 300px;
}

h1 {
    font-size: 1.5em;
    margin-bottom: 20px;
}

input[type="text"] {
    width: 80%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    padding: 10px 20px;
    border: none;
    background-color: #4caf50;
    color: white;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}

#feedback {
    margin-top: 15px;
    font-weight: bold;
}

#solution-container {
    margin-top: 20px;
    font-size: 0.9em;
    text-align: left;
}