crongro/[CSS] :before ,:after example

## [CSS] :before ,:after example
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## style.css
a {
  text-decoration : none;
  font-size : 2em;
  color : gray;
  padding : 0px;
}

a:hover {
  position : relative;
}

a:hover:after {
  content : "포털사이트로 이동";
  color : gray;
  opacity : 0.7;
  position : absolute;
  top : 0px;
  left : 0px;
  font-size : 0.4em;
  background-color : yellow;
}
	a {
	text-decoration : none;
	font-size : 2em;
	color : gray;
	padding : 0px;
	}

	a:hover {
	position : relative;
	}

	a:hover:after {
	content : "포털사이트로 이동";
	color : gray;
	opacity : 0.7;
	position : absolute;
	top : 0px;
	left : 0px;
	font-size : 0.4em;
	background-color : yellow;
	}