#login_painel{
    width: 500px;
    margin: 100px auto 0 auto;
    padding-top: 20px;
    border: 1px solid #CCC;
    border-radius:8px;
    background-image: linear-gradient(to bottom, #f4f4f4, #fff);
    overflow: auto;
}
#mensagens_de_erro{
    width: 800px;
    margin: 60px auto 0 auto;
}