JSFiddle - React, Tailwind, and code Playground

HTML

<label>Newspaper?</label>
        <input type="checkbox" name="nieu" onclick="change()"><br/><br/>
	<div id="nime">
	<label>How?</label>
		<select name="nime"> 
			<option value="email">Email</option>
			<option value="post">Post</option>
			<option value="beide">Both</option>
		</select>
	</div>

CSS

#nime{
    
    display:none;
}

JavaScript

function change(){
    which = document.getElementById('nime');

	if(which.style.display=="block"){
		which.style.display="none";
    } else{
	which.style.display="block";
    }
	
};