jquery - How can I change Javascript Value into percentage instead of pixels -


i want change scrolltop value 50px lets 1% of user's screen. how possibly go doing this. reading js value can percentage, not working me. here codepen made demonstrate effect:

[link] (http://codepen.io/ericshio/pen/zbrbay)

html:

<div class="filler"></div> <a href="#introjump"><img class="down-arrow" src="http://www.themainconcept.com/wp-content/uploads/2015/11/down-arrow-wht.png" alt="down arrow wht"/></a>

css:

.down-arrow {     position: fixed;     bottom: 1%;     left: 50%;     max-width: 3.5%;     min-width: 3.5%;     width: 3.5%;     box-shadow: none;     opacity: 0.6; }  .down-arrow:hover {     opacity: 1; }   .filler {     height: 10000px; }

js:

$(window).scroll(function() {   $(".down-arrow").css("opacity", 1 -     $(window).scrolltop() / 50); });

try this.

$(window).scroll(function() {   $(".down-arrow").css("opacity", 1 -     $(window).scrolltop() / $(document).height()*0.5); });

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