Ok, I had to change a bit your code because you were checking on ids (you shouldn’t have multiple elements with the same ID),
This should be ok for your case, so basically i create an array of light-sections and then check if scroll position is inside one of them
var $ = jQuery;
$(document).ready(function () {
var lightPos = [];
$(".light-background").each(function () {
lightPos.push({
start: $(this).offset().top,
end: $(this).offset().top + $(this).height()
});
});
$(window).scroll(function () {
var menuPos = $(".menu-btn").offset().top;
var isInLight = !!lightPos.some((light) => {
return light.start < menuPos && light.end > menuPos;
});
if (isInLight) {
$(".menu-btn").addClass("dark-color");
$(".menu-btn").removeClass("light-color");
} else {
$(".menu-btn").removeClass("dark-color");
$(".menu-btn").addClass("light-color");
}
});
});body {
margin: 0;
font-family: "Poppins", sans-serif;
}
ul {
list-style-type: none;
margin: 0;
padding: 0;
}
header {
display: flex;
}
.container {
text-align: center;
}
/*-------------------- COLORS */
.dark-background {
background: #313747;
}
.light-background {
background: #f4f4f4;
}
.dark-color {
color: #303030;
}
.light-color {
color: #f4f4f4;
}
/*-------------------- NAVIGATION */
nav {
position: fixed;
height: auto;
width: 100%;
margin: auto;
z-index: 10;
}
.menu {
display: flex;
padding: 2em 0 2em 3em;
text-align: left;
float: left;
}
.menu li a {
margin-right: 2em;
font-size: 1.2em;
font-weight: 700;
text-decoration: none;
}
/*-------------------- HERO CONTAINER */
.hero-container {
position: relative;
height: 100vh;
width: 100%;
}
/*-------------------- CONTENT CONTAINER */
.content-container {
position: relative;
display: flex;
width: 100%;
height: 100vh;
margin: auto;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="container">
<header>
<nav>
<ul class="menu">
<li><a href="#" class="menu-btn light-color">Page 1</a></li>
<li><a href="#" class="menu-btn light-color">Page 2</a></li>
<li><a href="#" class="menu-btn light-color">Page 3</a></li>
</ul>
</nav>
</header>
<div class="hero-container dark-background"></div>
<div class="content-container light-background"></div>
<div class="content-container dark-background"></div>
<div class="content-container light-background"></div>
<div class="content-container dark-background"></div>
<div class="content-container light-background"></div>
<div class="content-container dark-background"></div>
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