change text size contact hover

Can somebody tell where i can change the text size of the hover text in the contact form? See image.

I cannot find it....

Thank you

Anyone????

This is the solution:

File joomla.css (line 144) which you can find in template/css directory. You need to modify font-size value in this line :
.tip-title { background: #333; color:#fff; padding:2px 6px 0 6px; text-transform:uppercase; font-size: 16px; text-shadow: 0 1px 0 #000; margin-bottom: 4px; }