/* お知らせ詳細ページ全体のレイアウト */
#single-news {
  max-width: 900px;
  margin: 100px auto;
  padding: 0 20px;
  font-family: "Noto Sans JP", sans-serif;
  line-height: 1.8;
  color: #333;
}

/* 投稿日 */
#single-news .post-date {
  font-size: 0.9rem;
  color: #888;
  margin-bottom: 30px;
}

/* 本文 */
#single-news .content {
  font-size: 1rem;
  margin-bottom: 40px;
}

/* タイトル*/
.title_area{
  text-align: center;
  margin-bottom: 40px;
  border-bottom: 1px solid #000;
}
#single-news h1 {
  display: inline;
  text-align: center;
  font-size: 1.5rem;
  margin-top: 30px;
  margin-bottom: 10px;
  padding-bottom: 10px;
}
#single-news .date {
  margin-bottom: 20px;
}
#single-news h2 {
  font-size: 1.4rem;
  margin-top: 30px;
  margin-bottom: 10px;
  border-left: solid 5px #000000;
  padding: 0.25em 0.5em;
}
#single-news h3 {
  font-size: 1.2rem;
  margin-top: 20px;
  color: #333;
  border-bottom: 1px solid #000;
  margin-bottom: 10px;
}

/* 概要文 */
#single-news .summary {
  background: #f8f8f8;
  padding: 15px;
  margin: 20px 0;
  border-left: 4px solid #0075c2;
}

/* 戻るボタン */
#single-news a {
  display: inline-block;
  margin-top: 40px;
  padding: 0.25em 5em;
  background: #000;
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  transition: background 0.3s;
}
.btn_area{
text-align: center;
}
#single-news a:hover {
  opacity: .7;
}
@media (max-width: 640px) {
  #single-news h1 {
    padding: 0.25em 0.5em;
  }
}