OpacityNovember 12, 2011 by Laura Hartwigbackground-color:#30f;color:#fff;width:100%;opacity:0.5; for ie background-color:#30f;color:#fff;width:100%;filter: alpha(opacity=50); older browsers background-color:#30f;color:#fff;width:100%;-moz-opacity:0.5;Share this:TweetShare on TumblrPrintEmailRelatedYou might also like: How to make photos come to life with a little bit of CSS magic.