body {
    font-family: 'Arial', sans-serif;
}

.container {
    max-width: 800px;
}

#itensVenda, #listaClientes, #relatorioVendas {
    margin-top: 20px;
}

#itensVenda li, #listaClientes li {
    padding: 10px;
    margin-bottom: 5px;
}