.form-signin {
    max-width: 400px;
    padding: 15px;
    margin: 0 auto;
}

    .form-signin .form-control {
        margin-bottom: 5px;
    }

footer {
    position: absolute;
}

#txtLogin {
    text-align: center;
    margin-bottom: 5px;
}

@media (max-width: 767px) {
    footer {
        position: relative;
    }
}