Hi guys, I have a need to target Opera specifically as I am using Cufon fonts on this particular project which need need a minor alteration to it's style. I am using: @media all and (-webkit-min-device-pixel-ratio:10000), not all and (-webkit-min-device-pixel-ratio:0) { .sidebar li { margin: 0px 0px -10px 20px; } } Code (markup): Which is working great, but it's causing the CSS to be invalid (2.1 and 3), anyone in the know who can point me in the right direction? I'm using the very latest Opera browser update. Many thanks.