.top_img {
  background: url(../img/3-1/top.png) no-repeat center center;
}
section:nth-child(6) {
  background: url(../img/3-3/center.png) no-repeat center center;
  height: 1050px;
  width: 100%;
}
section:nth-child(7) {
  width: 61.5%;
  margin: 0 auto;
  margin-bottom: 5%;
}
.info {
  background-color: var(--bg);
  text-align: center;
  font-size: 22px;
  font-weight: bold;
  margin-top: 5%;
  padding: 3.5% 0;
  line-height: 1.5em;
}
@media (max-width: 768px) {
  section:nth-child(6) {
    margin-top: 5%;
    width: 700px;
    height: 600px;
    background-size: cover;
  }
  section:nth-child(7) {
    width: 90%;
    margin: 0 auto;
  }
  #footer {
    margin-top: 5%;
  }
}