Is there a particular text you wish to change the font size?

For the hornav menu hover try adding the following CSS to the Custom CSS field within your templates parameters.

[code type=css]#hornav ul a:hover, #hornav ul ul a:hover {color: #AAAAAA;}[/code]
... where #AAAAAA is your new hover colour.

Ciarán

Thank you Ciarán. The custom CSS works. And I put in
#hornav ul a:link, #hornav ul ul a:hover {font-size: 16px;}
#hornav ul a:hover, #hornav ul ul a:hover {font-size: 16px;}
to change the text size in the hornav menu.

I would like to change the hornav menu font in the Kontact template. I haven't found a Custom CSS field within the templates parameters.

I tried changing within the following css/template.css code without success.

/* Hornav - Parent Styling */
#hornav ul a, #hornav ul ul a, #hornav .separator {color:#fff; font-size:15px; font-weight:normal; line-height:25px; margin:0 0px 0px 0px; text-shadow:none}
#hornav li {background: none repeat scroll 0 0 transparent; float:left; padding:0; z-index:99999 !important;}
#hornav li a, #hornav .separator {margin:7px 0;}
#hornav li li a {font-weight:normal; overflow:hidden; padding:4px 8px; text-align:left; text-indent:0; z-index:9999 !important;}
#hornav ul a, #hornav .separator {display:block; padding: 4px 9px; text-decoration: none; z-index: 99999 !important;}
#hornav ul ul a {font-size:13px; margin:0px; color:#fff;}

You can try adding the following to the end of your templates template.css (../templates/j51_kontact/css/template.css)...

[code type=css]#hornav ul a, #hornav ul ul a, #hornav .separator {
color:#CCCCCC;
font-size:10px;
}[/code]
Where #CCCCCC is your link color, 10px your link font size.

Ciarán