Add Opera-specific vendor prefix in CSS gradients

Which DJANGO-VERSION are you using?
1.3

Which GRAPPELLI-VERSION are you using?
2.3

Which BROWSER (including the version) are you using?
Opera 11.10 on Linux

What steps will reproduce the problem?
1. Open the Grappelli dashboard in Opera
2. Take a look at box headers (these where it says 'Group: Administration & 
Applications', 'Media Management',  etc.)

What is the expected output? What do you see instead?
Expected: sexy gradients as in Chrome and Firefox
Actual result: flat backgrounds

I noticed that you guys maintain only -moz- and -webkit- prefixes for CSS3 
gradients. However Opera supports gradients since version 11.10, using a -o- 
vendor prefix. The syntax for gradient is the same as in the Mozilla-specific 
version, so the only change required would be to copy -moz- prefixed lines and 
replace the prefix with -o-. 

Regards,
Zbyszek (Opera fan since 6.0)

Original issue reported on code.google.com by antyqjon on 20 May 2011 at 11:17

pombreda / django-grappelli

Add Opera-specific vendor prefix in CSS gradients #369