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div {
	position: relative;
	
	&:hover {
	  
		&:after {
			background: #000;
			color: #fff;
			content: attr(data-title);
			padding: 7px;
			text-align: center;
			position: absolute;
			top: 100%;
			left: 50%;
			width: 100px;
			margin-left: -50px;
		}
		
	}
}

<div data-title="Title"></div>