.sty_related_article {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
}
.sty_related_article:after {
  content: "";
  display: block;
  width: calc(33.3333333333% - 25px);
}
.sty_related_article > li {
  width: calc(33.3333333333% - 25px);
  height: auto !important;
  margin-bottom: 40px;
  border-radius: 4px;
  overflow: hidden;
  background-color: #FFF;
}
.sty_related_article > li .img {
  text-align: center;
}
.sty_related_article > li .ttl {
  padding: 15px;
}
@media only screen and (min-width: 641px) {
  .sty_related_article > li a:hover img {
    opacity: 0.75;
  }
}
@media only screen and (max-width: 640px) {
  .sty_related_article:after, .sty_related_article:before {
    display: none;
  }
  .sty_related_article > li {
    width: calc(50% - 7px);
    margin-bottom: 30px;
  }
  .sty_related_article > li .ttl {
    padding: 10px;
  }
}