JSFiddle - React, Tailwind, and code Playground

HTML

<div class="topbar">Whoo pink headers FTW!
<div class="fixed-menu">Fixed!</div>
</div>
<div class="loads-of-content">
    [Insert some amazing website here]
    <div class="fixed-menu">Fixed!</div>
</div>

CSS

.topbar {
    background-color: pink;
    height: 100px;
    width: 100%;
    position: relative;
    overflow: hidden;
    z-index: 3;
}
.topbar .fixed-menu {
    color: red;
}
.fixed-menu {
    position: fixed;
    top: 20px;
    right: 50px;
        font-size: 2em;
}
.loads-of-content {
    height: 800px;
    position: relative;
    overflow: hidden;
}