Adding Font to "Defines the Font for your body text"

For the life of me, I cannot update the font list in the “defines the font for your body text”.

I tried adding the following to my functions.php but no luck:

add_filter( ‘avf_google_content_font’, ‘avia_add_content_font’);
function avia_add_content_font($fonts) {
$fonts[‘Quicksand’] = ‘Quicksand’;
return $fonts;
}

I tried the quick CSS method also no luck:

body {
font-family: ‘Quicksand’, ‘HelveticaNeue’, ‘Helvetica Neue’, Helvetica, Arial, sans-serif;
}

What do I have to do to add Quicksand to the list?