JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="animal.css">
    <link href="https://fonts.googleapis.com/css2?family=Kaushan+Script&family=Montserrat:300i,wght@400;700&display=swap" rel="stylesheet">
    <title>Animal</title>
</head>
<body>
    <header class="header">
        <h1 class="text_header">Название</h1>
            <nav class="nav">
                <a class="nav_link" href="#" target="_blank">home</a>
                <a class="nav_link" href="#" target="_blank">dogs</a>
                <a class="nav_link" href="#" target="_blank">cats</a>
                <a class="nav_link" href="#" target="_blank">fishs</a>
                <a class="nav_link" href="#" target="_blank">birds</a>
                <a class="nav_link" href="#" target="_blank">different</a>
            </nav>
    </header>
</body>
</html>

CSS

/*Header*/
.text_header {
  text-align: center;
  text-transform: uppercase;
  font-family: 'Montserrat', sans-serif;
}

/*nav*/
.nav {
  display: flex;
  justify-content: center;
  text-transform: uppercase;
}

.nav_link {
  //flex-direction: row;
  text-align: center;
  font-family: 'Montserrat', sans-serif;
  text-decoration: none;
  color: black;
  margin: 0 20px 40px;
  display: block;

}