Hi Zach,
Thanks for the prompt response. I’ve tried adding that CSS, but it doesn’t look like it has made any difference. It’s usually a small red cross symbol that I see, but it still would not appear to be visible when viewed on a mobile device. Just looking at it using developer tools on Google Chrome, the cross appears when the screen is made larger, but disappears when viewing it as mobile sized.
I’m currently using a theme called Virtue Premium by Kadence. Thanks for the suggestion of contacting them – that’s where I’ll try next.