* ''filter'' — you're probably using the Internet Explorer notation, which won't work in other browsers. As for Firefox, it doesn't support anything besides url() until Firefox 34.0 (the current release is Firefox 32.0). ** https://developer.mozilla.org/en-US/docs/Web/CSS/filter * ''-moz-opacity'' should be '''opacity'''. I can't imagine why you're using the prefixed property. Support for it was dropped all the way back in Firefox 3.5, and the unprefixed one has been supported since Firefox 0.9. ** https://developer.mozilla.org/en-US/docs/Web/CSS/opacity * ''#cccccc0'' should be '''#ccccc0''' or maybe '''#cccccc''' — I can't know which color you intended. ** https://developer.mozilla.org/en-US/docs/Web/CSS/color_value As for the remainder of the errors, there's no way to tell what they're about. Run your stylesheets through the validator to find out: * http://jigsaw.w3.org/css-validator/ If you want someone to help you with your page, you'll have to post a link to it.