Post format images

Leaf is a gorgeous theme.
I especially love the post format options e.g. audio and video options.
In categories the post images have a span class e.g. audio-format but this is not displayed in any other view.
In this view all my images have the lovely headphones added for audio-format
https://www.penelopesolomon.com/Topics/bbc-radio-london/

But headphones do not show in this view
https://www.penelopesolomon.com/

I would like all incidences of the image to have the span class i.e. to show the headphones. Can I fix with custom css possibly?

Many Thanks

Bridget