i need to resize the size of font in comment box.need to make it smaller

open: /files/common_css/style.css

find:
[code].fpost {
font-size:1.5em;
border: #C6D9EB 1px solid;
background: #EEF3F9;
color: #3A74AD;
}[/code]

change: [b]1.5[/b] to a new value - higher for a bigger font, lower for a smaller font.

thanks .solved

That's correct. But you'd better insert the codes to your "/themes/YOUR_THEME_FOLDER/page.css". Because the style.css will probably be replaced in upgrades.