getElementsbyclassname добавить класс
.newclassname { color: blue; }
Comfortable Curlew
.newclassname { color: blue; }.newclassname { border: 16px solid black; /* Light grey */
border-top: 16px solid black; /* Blue */
border-radius: 50%;
width: 120px;
height: 120px;
animation: spin 2s linear infinite; }
@keyframes spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}