body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 15px;
    text-align: center;
    width: 100%;
    max-width: 400px;
    box-sizing: border-box;
}

section {
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 100%;
    max-width: 400px;
    box-sizing: border-box;
    margin-top: 20px;
}

h1 {
    margin: 0;
    font-size: 24px;
}

h2 {
    font-size: 20px;
    color: #333;
    margin-bottom: 20px;
}

form {
    margin-bottom: 20px;
}

label {
    font-size: 14px;
    color: #555;
}

select, button {
    width: 100%;
    padding: 10px;
    margin-top: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
}

button {
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

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

p {
    font-size: 16px;
    color: #333;
    margin-bottom: 20px;
}

ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

li {
    font-size: 14px;
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}

/* Estilo para el número generado en grande */
.numero-grande {
    font-size: 72px;
    font-weight: bold;
    color: #4CAF50;
    margin: 20px 0;
}

/* Media query para dispositivos móviles con ajustes */
@media (max-width: 600px) {
    header, section {
        padding: 15px;
        margin: 0 10px;
    }

    h1 {
        font-size: 22px;
    }

    .numero-grande {
        font-size: 56px;
    }

    p {
        font-size: 18px;
    }

    li {
        font-size: 16px;
    }

    button {
        font-size: 18px;
    }
}