.archive-topics .set a {
  display: block;
}
.archive-topics .set a *,
.archive-topics .set a:hover * {
  transition: all .5s ease-in-out;
}
.archive-topics .set a:hover {
  opacity: 0.8;
}

.set__ttl {
  position:relative;
  padding-bottom: .5em;
  margin-bottom: 1em;
}

.set__ttl:after {
    position: absolute;
    content: "";
    display: block;
    width: 15%;
    height: 4px;
    background-color: #0187ff;
    bottom: 0;
    left: 0;
}
@media screen and (max-width: 640px) {
  .set__ttl {
    font-size: 4.7vw;
    margin: .3em 0;
  }
  .set__ttl:after {
      height: 2px;
  }
  .set__desc {
    font-size: 3.5vw;
  }
}