how to change font size of footer widget items

Site link?

here is the link

The selector you need is:
footer#footer h3

So try adjusting with:

footer#footer h3 {
font-size: 90%; /* Adjust */
}

If you meant the copyright footer then use:

footer#footer p {
font-size: 90%; /* Adjust */
}

thanks a lot

actually inspite of % i was using px so was not able to make the changes

closing this

You can put 20px or 2em etc instead of 90%. I just like % for responsiveness.

footer#footer p {
font-size: 2em; /* Adjust */
}