var elem = document.querySelector('#some-element');
// Set color to purple
elem.style.color = 'purple';
// Set the background color to a light gray
elem.style.backgroundColor = '#e5e5e5';
// Set the height to 150px
elem.style.height = '150px';
0
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js pridať štýl do každej triedy
var all = document.getElementsByClassName('someClass');
for (var i = 0; i < all.length; i++) {
all[i].style.color = 'red';
}