Make size of "Simple Grid Portfolio" smaller on MOBILE only?

Site URL: https://jimelliottvisuals.com

so. i've got the text size just how i want it under the thumbnails in the portfolio on desktop view (i changed this specifically in the advanced text section), but for some reason this text is massive on mobile view. Is there a way to make the text smaller on mobile view without affecting the main page?

Anyone out there?

to make text smaller on mobile, add this to Home > Design > Custom CSS

@media screen and (max-width:767px) {
h3.portfolio-title {
    font-size: 10px !important;
}
}