body {
    font-family: sans-serif;
    display: flex;
    flex-direction: column; /* Para que el copyright esté debajo */
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f4f4f4;
}

.container {
    text-align: center;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background-color: #fff;
}

.logo {
    width: 100px;
    margin-bottom: 20px;
}

#math-problem {
    font-size: 24px;
    margin: 20px 0;
}

input[type="text"] {
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 5px;
    margin-bottom: 10px;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

#result-message {
    margin-top: 10px;
    font-weight: bold;
}

.copyright {
    margin-top: 20px; /* Espacio entre el contenido y el copyright */
    text-align: center;
    font-size: 14px;
    color: #888;
}