It's only visible when zoom out.
At 100% not.
But when zoom out...
How can I make it visible all time without zoomout?
What's the link to your site and theme you are running?
its emerald theme light version ... color changed
I would ask at the D&D forums. I have a feeling it's table sizing but don't know right off hand without installing it and taking a closer look. They might be able to help you out with it faster there since they designed the theme.