Hi Ofi Khan, (and @Pavel)
Thanks for your suggestions.
Adding:
.claves-button::before {
content: url(/images/qrs_images/claves_zonder_achtergrond_kleur.png);
vertical-align: -75%;
}
to Template Options -> Custom Code -> Custom CSS
and refering to "claves-button" (without quotations) in both of the add-ons' CSS Class option
Solved the issue.
Could you explain why before it was working for only 1 button, and now when putting css. directy into template options it works allaround?
Before I was doing all of my CSS- styling trough: Extentions > templates > templates...
Then selecting the helix template. Then: CSS > Custom.css
What is the (main) difference? As both concern the same Template?
tahnks in advance for you answer.