body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
}

.valor-opcao, #pix-painel, #cartao-painel, #mensagem-sucesso {
    width: 80%;
    max-width: 600px;
    margin: 20px auto;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0px 0px 10px rgba(0,0,0,0.1);
}

.valor-opcao h1, #pix-painel h3, #cartao-painel h3 {
    margin-top: 0;
}

input[type="number"], input[type="text"], select {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
}

.oculto {
    display: none;
}

#bandeira img {
    height: 20px;
}