.login-form {
    width: 25rem;
    height: 23.75rem;
    position: fixed;
    top: 50%;
    margin-top: -12.375rem;
    left: 50%;
    margin-left: -12.5rem;
    background-color: #ffffff;
    opacity: 0;
    -webkit-transform: scale(.8);
    transform: scale(.8);
}
.img-flag {
    height: 16px;
}