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/*
Author       : Code-Theme
Template Name: Bitcoin - HTML5 Template
Version      : 1.0
*/

jQuery(document).on('ready', function ($) {
    "use strict";

/*---------------------------------
     //------ PRELOADER ------//
     ----------------------------------*/
    $('#status').fadeOut();
    $('#preloader').delay(200).fadeOut('slow');

/*---------------------------------
     //------ ANIMATE HEADER ------//
     ----------------------------------*/
    $(window).scroll(function () {
        var nav = $('.heading-3');
        var scroll = $(window).scrollTop();

if (scroll >= 80) {
            nav.addClass("bg-menu");
        } else {
            nav.removeClass("bg-menu");
        }
    });
    
    $(window).scroll(function () {
        var nav = $('.heading-6');
        var scroll = $(window).scrollTop();

if (scroll >= 80) {
            nav.addClass("bg-menu");
        } else {
            nav.removeClass("bg-menu");
        }
    });

/*----------------------------------
    //------ JQUERY SCROOLTOP ------//
    -----------------------------------*/
    var go = $(".go-up");
    $(window).on('scroll', function () {
        var scrolltop = $(this).scrollTop();
        if (scrolltop >= 50) {
            go.fadeIn();
        } else {
            go.fadeOut();
        }
    });

}(jQuery));

Editing File: under.js