Remove Date circle in event overview when on mobile

How do keep the date bubble/ circles on a large screen (pc/ table) but remove them when the event categories are is shown on mobile?
I would asume that it would have to be put into custom.css?
Something like...
_________
@media (max-width: 767px) { .xxxx {display:none}}

Hi

Yes. That's right direction. For the correct css code, I will need help from my template developer. So you can submit a support ticket sending us super admin account of your site and link to that page. We will look at it and help you with the css code if needed

Regards,

Tuan