【見出し】小見出し付き

<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>h2{
  width: 300px;
  height: 50px;
  line-height: 50px;
  padding: 0.5em;
  margin: 10px;
  color: #494949;
}

.midashi {
	position:relative;
	border:1px solid #142c5b;
}
.midashi:after{
	content: "midashi";
	position: absolute;
	top: -25px;
	left: 10px;
	background: #FFF;
	font-size: 12px;
	color: #142c5b;
	padding: 0 10px;
}</style>
</head>
<body>
<h2 class="midashi">小見出し付きの見出し</h2>
<script>
</script>
</body>
</html>

h2{
  width: 300px;
  height: 50px;
  line-height: 50px;
  padding: 0.5em;
  margin: 10px;
  color: #494949;
}

.midashi {
	position:relative;
	border:1px solid #142c5b;
}
.midashi:after{
	content: "midashi";
	position: absolute;
	top: -25px;
	left: 10px;
	background: #FFF;
	font-size: 12px;
	color: #142c5b;
	padding: 0 10px;
}