One of the new features is support for Font Awesome font icons. The advantage of using font icons is that they can scale to different sizes without distorting whereas using images can't scale without distorting or adding blurriness.
New to the applilcation are text-based member badges instead of image-based badges. If you want to add some extra flair to your premium member badge, you can inject a Font Awesome font icon with some simple custom CSS. First, you must select which font icon you want to use from the list on their website. Let's say you choose the fa-fighter-jet icon. To insert this at the beginning of your premium member badge, you would use the following CSS:
.h-member-badge-premium:before {
content: "\f0fb";
display: inline-block;
font: normal normal normal 14px/1 'Font Awesome 5 Pro';
font-size: inherit;
text-rendering: auto;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
transform: translate(0, 0);
margin-right: 5px;
}
The key to selecting the right icon is to change the "content" value in the above CSS to match the "Unicode" value listed on the icon's details page. You should see on the fighter-jet page that it lists "Unicode: f0fb" and you can see in the "content" value above that it is set to "\fofb" (the leading backslash is a necessary escape character).
If you'd prefer to have the icon display after the name, you need to change ":before" in the CSS selector to ":after" and then change the "margin-right" to "margin-left" so that the proper margin is applied.
Once you're done, you should have a badge that looks something like this:
You can make similar changes for any other permission circle badges you'd like, too. To do so, you just need to target the proper h-member-badge-<ID> CSS class, where the ID is the numeric ID for the permission circle.
(you also had replaced the 'h' with "webkits" which was not correct)