Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.
blink,
.blink {
	animation: 2s linear infinite blink; 
}

@keyframes blink {
	0%   {
	 	visibility: visible; 
		}
	50%  {
	 	visibility: hidden;
		}
	100% {
		visibility: hidden;
		}
	}
/*
Reference:

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/blink#CSS_Polyfill
*/