# Styling application in JavaScript

Let's make a button, by clicking on which the element will be either shown or hidden. Let the element be hidden by default (this is implemented using `display: none`), and it will be shown by adding the class `active` . This class will be either added or removed using `classList.toggle`:

`<button id="button">click me</button> <div id="elem"></div>` `#elem { display: none; width: 200px; height: 200px; border: 1px solid green; } #elem.active { display: block; }` `let button = document.querySelector('#button'); let elem = document.querySelector('#elem'); button.addEventListener('click', function() { elem.classList.toggle('active'); });`

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