Hi @bhoehner ,
Go to Appearance → Customize → Additional CSS (the menu labels might be different in your language) and try the code below:
.post-preview:hover header,
.post-preview:hover .preview-image:after { opacity: 0; }
.post-preview.category-lifestyle:hover header,
.post-preview.category-lifestyle:hover .preview-image:after { opacity: 1; }
That will make it so that only the “Lifestyle” category has the hover effect. Replace the “lifestyle” string with the slug of the category, which you can find by going to Admin → Posts → Categories. If you want to do this with multiple categories, replicate the second block of code like this:
.post-preview:hover header,
.post-preview:hover .preview-image:after { opacity: 0; }
.post-preview.category-lifestyle:hover header,
.post-preview.category-lifestyle:hover .preview-image:after { opacity: 1; }
.post-preview.category-meta:hover header,
.post-preview.category-meta:hover .preview-image:after { opacity: 1; }
Let me know if that does it.
— Anders