[Plugin: Visitor map generator] Transparency

I just installed the plugin and I like it so far, but I seem to have a transparency issue. The ‘icons’ and the Google logo and controls all seem to have a transparency issue: they’re surrounded by grey blocks, rather than by the ‘map.’

Am I making a simple mistake? It looks great on your website!

http://wordpress.org/extend/plugins/visitos-map-ip/