JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    <div class="container">
    container1
        <div id ="element" class="element">
            fixed
        </div>
    </div>
    <div class="container2">
    container2
    </div>
</div>

CSS

.wrapper {
    width:100%
}
.container {
    width:300px;
    margin:0 auto;
    height:1200px;
    background:#ccc;
    position: relative;
}

.container2{
     width:300px;
    margin:0 auto;
    height:1200px;
    background:#fcf; 
}
.element {
    background:#f2f2f2;
    position:fixed;
    width:50px;
    height:70px;
    margin-left:250px;
    border:0px solid #d6d6d6;
}

JavaScript

document.addEventListener("scroll", function(event) {
	if(window.pageYOffset >= 1200){
  	console.log("1200");
  } if (window.pageYOffset <= 1200){
    console.log("<1200");
  }
});