Make div appear and change the whole html to be darker

Question

I have a div and after I click a button, I would like the div to appear (which I can do), but I would like the whole background to become darker too (this is inline with overlay

Answer 1

This can be now done even easier than before. Just use absoluted box-shadow.

 #yourDIV {
   box-shadow: 0px 0px 1px 5000px rgba(0,0,0,0.8);
 }