On this page I'm trying to increase the size of the FAQ

Hello,

On this page I'm trying to increase the size of the FAQ Titles:
http://m67.siteground.biz/~broadw39/vancouver-chiropractic/

I've tried this CSS, but it's not working:

.mk-toggle.fancy-style .mk-toggle-title span {
font-size:16px !important;
}

Thanks in advance,
Casper