yeah, so on mobile the topic footer controls are an entirely separate component so your CSS is a little too specific and only applies to desktop…
This should work for both:
#topic-footer-buttons {
.flag-topic,
.share-and-invite {
display: none;
}
}
We’ve got a little tutorial on checking for CSS selectors: Make CSS changes on Your Site
Mobile can be a little tricky to check if you don’t have a development environment set up, but if you add ?mobile_view=1
to the end of your forum’s URL this allows you to view mobile on a desktop, which can make it easier to work with.