Edit in JSFiddle

<br><br><br>
<a href="#" title="Красивая всплывающая подсказка" class="tooltip">Наведи на меня</a>

		.tooltip{
   			display: inline;
    		position: relative;
		}

		.tooltip:hover:after{
    		background: #333;
    		background: rgba(0,0,0,.8);
    		border-radius: 5px;
    		bottom: 26px;
    		color: #fff;
    		content: attr(title);
    		left: 20%;
    		padding: 5px 15px;
    		position: absolute;
    		z-index: 98;
    		width: 220px;
		}

		.tooltip:hover:before{
    		border: solid;
    		border-color: #333 transparent;
    		border-width: 6px 6px 0 6px;
    		bottom: 20px;
    		content: "";
    		left: 50%;
    		position: absolute;
    		z-index: 99;
		}