Centering Site Title

Hi there,
I’ve looked through all the previous posts and custom CSS regarding centering the site title with Vantage Theme.

Unfortunately I can’t get it to work. Any help would be greatly appreciated.

Thanks for a great free theme and what looks to be incredible support. Really helps a total newcomer like myself!

This is what I have in my Custom CSS:

/* Vantage center the site title and hide support text */

header#masthead .hgroup .logo {
float: none;
}

header#masthead .hgroup h1 {
text-align: center;
}

header#masthead .hgroup .support-text {
display: none;
}