Howdy, Trying to increase the font size of the "learn more"

Howdy,

Trying to increase the font size of the "learn more" buttons (see image) on this page: http://www.islandrolfing.com

I was using this CSS, but I belive the class has changed with a recent theme update:

.mk-button.savvy-dimension span {
font-size: 16px;
}

Thanks in advance,
Casper