.span-login{
    width: 45%;
    display: flow;
    justify-self: center;
    border: double;
    border-radius: 6px;
    text-align: center;
}

.btn-form{
    margin-bottom: 10px ;
}

@media (max-width: 420px) {
    .span-login
    {
    width: 60%;

    }
}