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Hello,

You can use some custom css in order to remave (if required) your text, contained in a span, then add your image.
First, to see how to proceed to add some custom Css have a look on this documentation .

Then create your custom Css, like this shown with this kind of code :
.your_button_class span {display:none;}
.your_button_class:before {content: url('url_link_url/image.png');}

This will allow you to add your image without editing your HikaShop view.
Regards

Hello,

Yes, You have just to follow the example of the tutorial in my previous message and so paste it in your frontend file css (or custom frontend file, if you have already some custom Css).
Note that the style.css can be used too.

For a methodological point of view, put your custom custom css at the end of your file, in order to better find your custom later, and that increase his priority.
Other advice for your your custom css from your last message, I encourage you to add some html class in your selector, in order to increase your command priority too.
Learn more about selector, here .

Hope this will help you.
Regards