html - changing margin-top of element while scrolling ,javascript -


i want attach element bottom of navbar navbar fixed so in top when scroll problem how change margin-top of element top bottom of nav bar .. , bottom fixed .. (it hidden if scoll lot ) heigth of element smaller when scroll

here did 

 $(document).on('scroll', function (e) {     $('.imagebleu').css('opacity', ($(document).scrolltop() / 500));     $('.imagebleu').css('margin-top', ($('.navbar').heigh()+$(document).scrolltop())); });

if need more code post here link page 

  http://rechmed.byethost9.com/android_connect/

enter image description here

the part contain text nav bar , other part .imagebleu element have same opacity , because element under navbar navbar opacity doesn't same it

so want add margin changes scrolling fix element on bottom of navbar

thank much

i did solution based on layers (with z-index)

.imagebleu {     background-color: #3498db;     border-color: transparent;     opacity: 0;    height: 100%;   width:100%;   margin-top:50px;   position: fixed;   right: 0;   left: 0;    z-index:3; }

the margin-top:50px heigh pf navbar ,so element right under nav bar : 0px between them

position fixed made element cover page, added z-index make element between content of page , paralax image

something :

 navbar>content>this element>paralaximage  (the z-index)

the element when scrolling hide parallax image, , content hide "element"(.imagebleu) ,but no 1 hide navbar

i update website can see difference

  rechmed.byethost9.com/android_connect

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