JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="wrap">
        <p>bah</p>
    </div>
</div>

CSS

.container {
    y-overflow: hidden;
    position: relative;
    height: 200px;
    width: 200px;
    border: 1px solid red;
}

.wrap {position:absolute; bottom: 0; left:0;right:0;
}

JavaScript

var wrap = $(".wrap");
setInterval(function() {
    wrap.append("<p>smeh!</p>");
},250);