Making the Members Area Sign Up button bigger

Hi!

How can I change the size of the members sign up button?

Thought I should be something like:

[data-test="member-area-block-join"]
{
    padding: 14px 18px;
    font-size: 11px;
    min-width: 130px;
}

But doesn't work, any ideas?

Can you share your website URL and site wide password?