Decrease icon size in mobile

Site URL: http://precisiondesignbuildinc.com

I am trying to figure out how to decrease the size of the icons in the mobile view of my site: http://precisiondesignbuildinc.com. Currently they stack on top of the text which is fine, but they are too large. Is there a way to adjust this?

Thanks!

You mean 3 images?

Add to Home > Design > Custom CSS

@media screen and (max-width:767px) {
div#page-section-5f777e3d03db073de4e03093 .image-block {
    width: 50%;
    margin: 0 auto;
}
}