.index .section.section-20th {
  margin: 0 0 74px 0;
}

.index .section.section-20th .bnr {
  display: block;
  width: 650px;
  margin-inline: auto;
  background-color: #fff;
}

.index .section.section-20th .bnr img {
  transition: opacity 0.15s linear;
}

.index .section.section-20th .bnr:hover img {
  opacity: 0.5;
}