How to add custom icon to "tabs" title

Hi,

We would like to add our own icons to appear in front of the title of the "tabs" functionality found within Visual Composer.
Currently it will let you add an icon to appear before the title, however there's no custom options.

Could this be done using CSS?
We have tried to add the following to the tab title "<i class="pc-icon-listing-credit"></i>" however it doesn't appear to work (we have obviously set the css up currently for the class "pc-icon-listing-credit")

Thanks!

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