<body>
<div class="sidebar">
<button>닫기</button>
</div>
<script>
const sidebar = document.querySelector('.sidebar');
const btn = document.querySelector('.sidebar button');
openToggle = () => {
sidebar.classList.toggle('active');
}
/*
function openToggle() {
sidebar.classList.toggle('active');
}
*/
btn.addEventListener('click', openToggle);
</script>
</body>