javascript - Is there a way of making my div background less and less transparent while user keeps scrolling the webpage? -

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i have bootstrap webpage uses video background. more, i'm using following css code:

.transparent{     box-shadow: 0 0 0 1000px rgba(0, 999, 0, 1);     overflow:hidden;  }  #imgbox{     box-shadow: 0 0 0 1000px rgba(0, 999, 0, 1);  }

to make "hole" in covering layer, when user see's layer - see part of video underneath. it's hard explain, take @ example: http://jsfiddle.net/leytgm3l/31/

i want achieve effect, green layer transparent @ beginning (let's has rgba(0, 999, 0, 1), when user keeps scrolling down , layer becomes more , more visible, gets less transparent (so when it's visible should have rgba(0,999,0,1) example. how can achieve jquery or css?

i not sure requirement checkout updated jsfiddle of your's

just added $("#black").css("opacity",$("body").scrolltop()/1000); in $(window).scroll such increase opacity on window scroll , using small amount since value of opacity can withing range of 0 1

http://jsfiddle.net/leytgm3l/36/


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