Hi Emmykk,
To integrate fonts exactly like clean retina theme fonts Go to Appearance -> Theme Options -> Webmaster Tools -> Analytics and paste the following code.
<link href='http://fonts.googleapis.com/css?family=Gentium+Basic:400,700,400italic' rel='stylesheet' type='text/css'>
after that Now Integrate the font into your CSS Go to Appearance -> Theme Option -> Design Option Tab -> Custom CSS and paste you CSS code:
body,
input,
textarea,
#site-description,
.slogan-wrap
.slogan span,
#access select {
font: 13px 'Gentium Basic', serif;
}
Note: Change above digit value to increase or decrease the size of font.
Now Click on Save all Changes Button and refresh your browser.
Thank you for using our theme.