JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <header>
        <nav>
            <ul>
                <li>Uvod</li>
                <li>O mne</li>
                <li>Predstaveni</li>
                <li>Galerie</li>
                <li>Videa</li>
                <li>Kontakt</li>
            </ul>
        </nav>
    </header>
</body>

CSS

nav ul {
    list-style-type: none;
}
nav ul li {
    position: fixed;
    top: 0;
    left: 0;
    display: inline-block;
}