Login Form Not Responsive

I have an issue with the login form not being mobile responsive. I contacted WP Pro support but they told me this was not covered by them and its my responsibility to work on.

I have added this code to CSS:
@media (max-width: 768px) {

.em-booking-form-details {
float: none;
display: block;
width: 100%;
}

.em-booking-login {
float: none;
margin: 30px 0;
display: block;
width: 100%;
}

}

But it does not work. I must be missing something that is preventing my login form from dropping to the next line in mobile.

The page I need help with: [log in to see the link]