JSFiddle - React, Tailwind, and code Playground

HTML

<h1>Título Página</h1>
<div id="loginBlock">
    <form action="login.php" method="post" autocomplete="on">
        <table class="navmenu">
            <tr>
                <td><label for="username">Usuario: </label></td>
                <td><label for="password">Contraseña: </label></td>                    
            </tr>
            <tr>
                <td><input type="text" name="username" id="username" /></td>
                <td><input type="password" name="password" id="password" /></td>
                <td><input type="submit" value="Entrar" name="submitLogin"</td>                            
            </tr>
            <tr>
                <td><a href="">Registrarse</a></td>
                <td><a href="">Recuperar contraseña</a></td>
            </tr>
        </table>
    </form>
</div>

CSS

#loginBlock {
    border:2px solid green;
    float:right;
}

#loginBlock, label, a {
    padding-left:1px;
}
h1{
 display:block;
  float:left
}