Change header text font style – Vantage Premuim

Hi

How do I change the header text font and style in the header text in Vantage Premuim. I don’t want it to be italic, I need it to be bold.

I have used the following code in the Custom CSS page:

/* Vantage Support Text */

header#masthead .hgroup .support-text {
color: #000000;
font-size: 29px;
font-style: italic;
}

I tried replacing italic with strong and bold (see below), but it made no difference, the font is still italic, and not bold:

/* Vantage Support Text */

header#masthead .hgroup .support-text {
color: #000000;
font-size: 29px;
font-style: italic;
}

/* Vantage Support Text */

header#masthead .hgroup .support-text {
color: #000000;
font-size: 29px;
font-style: strong;
}