JSFiddle - React, Tailwind, and code Playground

HTML

<div class="main">Main Content</div>
<div class="dialog">Dialog causing Scroll</div>

CSS

.main {
    background-color: red;
    width: 100%;
    height: 100%;
}
.dialog {
    position: absolute;
    top: 800px;
    left: 0px;
    width: 200px;
    height: 200px;
}