Perhaps I should include an image of how it looks in my content template.
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The icons are white with no background (Transparent), and I find it odd that there is no option in the block you can use to change the background color.
Currently, the social icons are generated using CSS. And the social icons are SVG images. Check this screenshot hidden link
This means that they can be customized using CSS and SVG. But, note that Transparency is not part of the SVG specification even if some browsers support it https://stackoverflow.com/questions/18580389/svg-transparent-background-web
Let me escalate this as a feature request to our 2nd Tier. But, I can't tell if we will handle it or when we will do it.
This ticket is now closed. If you're a WPML client and need related help, please open a new support ticket.