.article-card {
  display: block;
  text-align: center;
  width: 180px;
  height: 240px;
  margin: 5px;
  padding: 3px;
  border: 1px solid #000000;
}

.article-eyecatch-img-container {
  margin-top: 10px;
  border-bottom: 1px dashed #000000;
}

.article-eyecatch-img {
  padding: 3px;
  border: 1px solid #000000;
}

.article-link-container {
  display: block;
  position: relative;
  top: 45px;
  left: 80px;
  text-align: center;
  width: 90px;
  height: 30px;
  margin-right: 3px;
  border: 3px double #000000;
}

main {
  position: relative;
  top: auto;
  left: 0;
  width: 75%;
  margin: 10px;
  padding: 10px;
  background-color: #FFFFFF;
  border: 1px solid #000000;
}

.article-link {
  color: #000000;
  text-decoration: none;
}

.article-link:hover, .article-link:focus {
  color: #FFFFFF;
}

.article-link-container:has(.article-link:hover, .article-link:focus) {
  background-color: #000000;
  border: 3px double #FFFFFF;
}

.sidebar {
  position: relative;
  float: right;
  top: auto;
  right: 0;
  width: 384px;
  margin: 10px;
  padding: 10px;
  background-color: #FFFFFF;
  border: 1px solid #000000;
}

@media screen and (max-width:680px) {
  main {
    width: 90%;
    border: none;
  }

  .sidebar {
    display: none;
  }
}

th, td {
  border: 1px solid #000000;
}