Check it out Martin why is this happening when display. Try to view it on firefox browser and scroll up and down.
http://eclass.adzu.edu.ph/mod/resource/view.php?id=1380&subdir=/Font_Collections
Looks fine to me under Firefox - what's happening on your screen?
Martin try to scroll up and down to bottom. You'll see what I mean... The background tends to disappear
I did, and no, nothing wrong like that. It's a client problem on your machine (low memory?).
Thanks... Martin