CSS background opacity

How to adjust the opacity of the background of a div without affecting child elements:

.alpha60 {
  /* Fallback for web browsers that doesn't support RGBa */
  background: rgb(0, 0, 0);
  /* RGBa with 0.6 opacity */
  background: rgba(0, 0, 0, 0.6);
}

Monday, January 23, 2012