JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outer">
    <div class="inner">width: 80%</div>
    <div class="inner2">width: 80.5%</div>
    <div class="inner3">width: 81%</div>
</div>

CSS

.outer {
    height: 4000px;
    width: 400px;
    background-color: black;
    position: relative;
}

.inner, .inner2, .inner3 {
    height: 50px;
    top: 10px;
    position: absolute;
    background-color: hotpink;
    left: 25px;
    color: white;
    text-align: center;
    
}

.inner {
    width: 80%;
}

.inner2 {
    top: 70px;
    width: 80.5%
}

.inner3 {
    top: 130px;
    width: 81%;
}