<h2>見出しのサンプル</h2>
囲い枠に丸みをもたせた見出しです。
h2 {
  background: #aee3f9;  /*背景色*/
  padding: 10px 10px 10px 10px;  /*余白*/
  border-radius: 10px;  /*角に丸み*/
}

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