diff --git a/webone.conf b/webone.conf
index 7cf38de..5ffde7c 100644
--- a/webone.conf
+++ b/webone.conf
@@ -625,6 +625,35 @@ AddReplace=-webkit
 AddFind=(-moz--webkit)
 AddReplace=-webkit
 
+
+; Opera 9.6, 10.x, 11.x, 12.0 CSS3 patches
+[Edit]
+OnContentType=text/css
+OnHeader=User-Agent: Opera/9.6
+OnHeader=User-Agent: Opera/9.7
+OnHeader=User-Agent: Opera/9.8.*Version/10
+OnHeader=User-Agent: Opera/9.8.*Version/11
+OnHeader=User-Agent: Opera/9.8.*Version/12.0
+AddFind=(background-size|box-sizing|box-shadow|text-shadow|border-radius|border-image|column-.*|animation-.*transition|transform|repeating-linear-gradient|linear-gradient|repeating-radial-gradient|radial-gradient|flex)
+AddReplace=-o-$1
+AddFind=to bottom
+AddReplace=top
+AddFind=to top
+AddReplace=bottom
+AddFind=to right
+AddReplace=left
+AddFind=to left
+AddReplace=right
+AddFind=(text--o-transform)
+AddReplace=text-transform
+AddFind=(-o--o)
+AddReplace=-o
+AddFind=(-webkit--o)
+AddReplace=-o
+AddFind=(-moz--o)
+AddReplace=-o
+
+
 ; Enforce security & spoof CORS
 [Edit]
 IgnoreUrl=webdav