The short code should have an option to to have more configuration options to customise the login form.

1. Ability to specify the label for each input

2. Custom class for the button

3. Wrap the input fields + label with div so it is possible to add more styling (i.e. row styles)

4.Ability to add class for the container

5. Ability to specify title above the form

https://en-gb.wordpress.org/plugins/clinked-client-portal/