on a test site i use the gravity views plugin. I found that the different elements can be easily styled or that I can create a layout with the traditional CSS properties like floats etc. What does not work at all is the CSS Grid layout.
Can you please let me know where i am going wrong. Maybe the theme does not support the CSS grid properties.
I would have to see exactly what isn’t working. The theme itself won’t prevent any custom elements from having CSS applied – whether it’s CSS Grid or something else.