Click through div to underlying elements

Yes, you can click through div to underlying elements by following the below mentioned way:-

You can do this by using the pointer-events: none along with CSS conditional statements for IE11 you can get a cross-browser compatible solution for this problem.

Another thing you can do is by using AlphaImageLoader, you can even put transparent.PNG/.GIFs in the overlay div and have clicks flow through to elements underneath.

See the CSS you can use below:-

pointer-events: none;
background: url('your_transparent.png');
Below is the IE11 conditional:-
filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='your_transparent.png', sizingMethod='scale'); 
background: none !important;

This way you can use css click through to underlying elements.