JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <nav class="panel-nav">
        <ul>
            <li><a href="#about us">About us</a></li>
            <li><a href="#portfolio">Portfolio</a></li>
            <li><a href="#contacts">Contacts</a></li>
        </ul>
    </nav>
</div>

CSS

*{
    padding: 0;
    margin: 0;
}
.container{
    width: 1500px;
    min-height: 2000px; /* Just added to get scroll */
    background: #eee;
    position: relative;
}
/* Top left of corder of the browser */
.panel-nav{
    position: fixed;
    top: 0;
    right: 0;
}