JSFiddle - React, Tailwind, and code Playground

HTML

<div class="foo">
    <div class="content"></div>
    <div class="logo-in-the-bottom">Logo</div>
</div>

CSS

.foo {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: gray;
    overflow-y: auto;
}
.content {
    height: 1000px;
}
.logo-in-the-bottom {
    position: absolute;
    bottom: 10px; left: 0;
    color: white
}