CSS background color transparency
Need to pick a color but with a little bit of transparency? No hassle, CSS3 is happily available for you to pursue the task of making the web a nicer looking place.
Here's the CSS code to give your div a half transparent background color:
Change 0.5 from 0 to 1 to get your desired transparency level.
Change 255,0,255 to match your desired color code in RGB.