JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main">
    <div id="mainPaddingEdge"></div>
    <div id="mainContentEdge"></div>
    <div id="inner"></div>
</div>

CSS

#main {
    background: Khaki;
    padding: 50px;
    overflow-x: hidden;
    overflow-y: auto;
    height: 300px;
    width: 300px;
    position: relative;
}
#mainPaddingEdge {
    border: 2px solid green;
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
}
#mainContentEdge {
    outline: 2px solid red;
    float: left;
    height: 100%;
    width: 100%;
}
#inner {
    background: white;
    height: 400px;
}