document.addEventListener('DOMContentLoaded', function () {
if (window.innerWidth < 640) {
document.querySelector('.my-element').classList.remove('class-name');
} else {
document.querySelector('.my-element').classList.add('class-name');
}
});
body{
font-family: 'Jura', sans-serif;
font-family: 'Chakra Petch', sans-serif;
}