ASP.NET Watermark over page

Is there a way to create a light see through watermark over an entire web page? One that stays on the screen, even if its scrolled? My thought was to create a .PNG bitmap and use a DIV tag with a style sheet that has my PNG set to the 开发者_开发问答background image, as well as position absolute set. The problem is, I don't think it will scroll as my page scroll. Any suggestions?

what you are looking for is position: fixed in css. Here is a pretty good rundown you can check out

You can set the background-attachment property. More info here

To have the background image remain whilst the user scrolls, set:

background-attachment:fixed;

If you want it to remain in one place and disappear if the user scrolls (which I guess you don't, but for future info :) ) The 'scroll' is no required, as it's the default setting, but for readability, you can add it.

background-attachment:scroll;