Links not right in Safari, but ok in Firefox and Chrome

Hello,

On this page I can't figure out why the teacher's names/links don't show in Safari, but do in Firefox and Chrome.

http://beingwellyoga.com/being-well-yoga-teachers/

It seems to be related to this CSS below, which is to keep links on the homepage white, whether they've been visited or not.

/* Links Not Change Colour on Material Cards on Home Page */
.page-id-158541 .post_content a:not(.button), .post_content a:visited:not(.button) {
color: #fff;
}

Support access granted if you require access. CSS is in Fortuna Options > Custom CSS.

Please advise.

Thanks in advance,
Casper