JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="pt-br">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Aluraconf</title>
    <link rel="stylesheet" href="css/reset.css">
    <link rel="stylesheet" href="css/header.css">
</head>
<body>
    <header class="header">
        <div class="container">
            <nav class="navbar">
                <ul>
                    <li><a href="#">Sobre</a></li>
                    <li><a href="#">Palestrantes</a></li>
                </ul>
            </nav>
        </div>
    </header>
</body>
</html>

CSS

.container {
    max-width: 1280px;
    margin: 0 auto;
}
.header {
    background: url("../img/destaque.jpeg") no-repeat;
    background-size: cover;
    padding: 2em 0;
}
.header .navbar>ul {
    text-align: center;
}
.header .navbar>ul>li{
    display: inline-block;
    padding: 1.5em 0.3em;
    background-color: rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    margin: 0 0.2em;
    transition: background-color 0.5s;
}
.navbar>ul>li:hover {
    background-color: #48A3A6;
}
.navbar>ul>li>a {
    color: #FFF;
    text-decoration: none;
    font-weight: bold;
    padding: 1.5em;
    text-transform: uppercase;
}