【見出し】シンプルアイコン

<!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;
  padding: 7px 0 7px 35px;
}

.midashi:after {
  position: absolute;
  top: 25px;
  left: 10px;
  z-index: 2;
  content: '';
  width: 15px;
  height: 15px;
  background-color: #142c5b;
}</style>
</head>
<body>
<h2 class="midashi">シンプルアイコンの見出し</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;
  padding: 7px 0 7px 35px;
}

.midashi:after {
  position: absolute;
  top: 25px;
  left: 10px;
  z-index: 2;
  content: '';
  width: 15px;
  height: 15px;
  background-color: #142c5b;
}