Logo/Headline spacing

A while back I asked:
Is it possible to lessen the space between the set logo and the headline?

Your reply was:
You can just do this with CSS, this should get you started:

h1.age-gate-logo {
margin-bottom: 1px;
}
Just change the 1px to whatever you need.

This did not work. Not sure if things have changed since within the CSS?

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