JSFiddle - React, Tailwind, and code Playground

HTML

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CSS

html,
body {
    padding: 0;
    margin: 0;
    overflow: hidden;
}

#main {
    position: absolute;
    left: 0;
    top: 0;
    right: -30px;
    bottom: 0;
    padding-right: 15px;
    overflow-y: scroll;
    max-height: 400px;
}