JSFiddle - React, Tailwind, and code Playground

HTML

<div class="progress-bar">
    <div class="progress-bar__inner">
        <div class="progress-bar__scale"></div>
    </div>
</div>
<div class="knowledge-bl__percentage">0%</div>
<div class="knowledge-bl__txt-cont">
    <div class="percentage-reserve-100">100%</div>
</div>

CSS

.progress-bar {
    margin-top: 1000px;
	height: 48px;
	border: 1px solid #cfcfcf;
	padding: 5px;
}

.progress-bar__inner {
	position: relative;
	width: 100%;
	height: 100%;
	background-color: #e9ebec;
}

.progress-bar__scale {
	position: absolute;
	top: 0px;
	left: 0px;
	height: 48px;
	width: 0px;
	background-color: #00adef;
	-webkit-transition: 1s;
	transition: 1s;
}

.progress-bar__scale-25 {width: 25%;}
.progress-bar__scale-50 {width: 50%;}
.progress-bar__scale-75 {width: 75%;}
.progress-bar__scale-100 {width: 100%;}
.invis {visibility: hidden;}

.knowledge-bl__txt-cont {position: relative;}

.knowledge-bl__percentage {
	float: left;
	width: 260px;
	margin-top: 36px;
	margin-left: 7px;
	font-size: 98px;
	font-weight: 700;
	color: #00adef;
    margin-bottom: 1000px;
}

.percentage-reserve-100 {
	position: absolute;
	width: 260px;
	top: 36px;
	left: 7px;
	font-size: 98px;
	font-weight: 700;
	color: #00adef;
	display: none;
}

.db {display: block !important;}

JavaScript

$(window).scroll(function(){
	if ($(this).scrollTop()<=4350)
	{
		$(".knowledge-bl__percentage").html("0%");
	}
	if ($(this).scrollTop()>600)
	{
		$(".progress-bar__scale").addClass('progress-bar__scale-25');
		$(".knowledge-bl__percentage").html("25%");
	}
	if ($(this).scrollTop()>700)
	{
		$(".progress-bar__scale").addClass('progress-bar__scale-50');
		$(".knowledge-bl__percentage").html("50%");
	}
	if ($(this).scrollTop()>800)
	{
		$(".progress-bar__scale").addClass('progress-bar__scale-75');
		$(".knowledge-bl__percentage").html("75%");
	}
	if ($(this).scrollTop()>900)
	{
		$(".progress-bar__scale").addClass('progress-bar__scale-100');
		$(".knowledge-bl__percentage").html("100%");
		$(".percentage-reserve-100").addClass('db');
		$(".knowledge-bl__percentage").addClass('invis');
	}
});