JSFiddle - React, Tailwind, and code Playground

HTML

<select name="niveau" class="niveau"> 
	<option value="facile">facile</option> 
	<option value="moyen">moyen</option> 
	<option value="difficile">difficile</option> 
</select>

<input type="button" name="submit" class="submit" value="Ok"/>
    
<div class="paf"></div>

<script>
$(function(){
	$('.submit').click(function(){
	var niveau = $('.niveau').val();
		$('.paf').text(niveau);
	});
});
</script>