main {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  width: 100%;
}
main article.blog_detail {
  flex: 1;
  min-width: 0;
  width: 100%;
  padding: 20px;
  background: #ffffec;
  color: #4a2c2a;
  border-radius: 10px;
  box-sizing: border-box;
}
main article.blog_detail span.date {
  font-weight: bold;
}
main article.blog_detail h2 {
  padding-bottom: 5px;
  border-bottom: 2px solid #4a2c2a;
  margin-bottom: 20px;
}
main article.blog_detail h2 p {
  font-weight: bold;
}
main article.blog_detail .post_content p {
  font-weight: bold;
}
main article.blog_detail .post_content img, main article.blog_detail .post_eyecatch img {
  width: 50%;
  height: auto;
  display: block;
  max-width: 750px;
  box-sizing: border-box;
}
main article.blog_detail div.post_eyecatch {
  max-width: 80%;
  margin: 0 auto 20px;
}

@media screen and (max-width: 750px) {
  main {
    padding: 0 15px;
  }
  main article.blog_detail {
    padding: 15px;
    border-radius: 0;
  }
  main article.blog_detail div.post_eyecatch {
    max-width: 100%;
  }
}