【見出し】ポストイット風

<!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 {
  background: #d1f1f1;
  border-left: solid 5px #142c5b;
  border-bottom: solid 3px #d7d7d7;
}</style>
</head>
<body>
<h2 class="midashi">ポストイット風の見出し</h2>
<script>
</script>
</body>
</html>

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

.midashi {
  background: #d1f1f1;
  border-left: solid 5px #142c5b;
  border-bottom: solid 3px #d7d7d7;
}