JSFiddle - React, Tailwind, and code Playground

HTML

<div class="dialogue">
        <div class="content">
            <p>Text</p>
            <p>Text</p>
            <p>Text</p>
            <p>Text</p>
            <p>Text</p>
            <p>Text</p>
            <p>Text</p>
            <p>Text</p>
            <p>Text</p>
            <p>Text</p>
        </div>
        <div class="footer">
            Footer
        </div>
    </div>

CSS

.dialogue{
    width: 200px;
    height: 500px;
    position: relative;
    background: red;
}
.dialogue .footer{
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: #000;
    color: #fff;
}