Colours not visible on products, name does appear when hovering

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Hi, could someone help me with the following problem?

On the WP Dashboard under Products | Attributes, I added two features: – — One for the size (XS – XL) with labels. These appear without any problems.
– The other is for the colour (green / purple / orange-black).
There are 3 circles on my webshop (referring to the 3 colors), but the circles are blank.
The colour itself (that I chose while setting this feature) is not visible.
If I hover over the circle, the name of the colour does appear.

I have already disabled all my plugins, but even if only Woocommerce and Variation Swatches for WooCommerce are activated, the problem remains.

Thanks in advance

The page I need help with: [log in to see the link]

 

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