Product-card-component using flexbox

Hi! Just finished my second project. I had some trouble with adding an icon-cart to a button (After adding the icon, the text in the button moved down a bit). Font-family: "fraunces" looks kinda different in Opera gx and Edge, can someone explain why this font looks weird in Opera gx? In this project i tryed to use em and rem units but im not sure i using them correctly.I will be grateful for feedback.