.title {
  font-size: 34px;
  text-align: center;
  margin-top: 100px;
}

.main .case {
  box-sizing: border-box;
}
.main .case:nth-child(1) {
  padding-top: 80px !important;
}
.main .case:nth-child(odd) {
  height: 690px;
  padding: 120px 0;
}
.main .case:nth-child(odd) .cover {
  width: 668px;
  height: 410px;
}
.main .case:nth-child(even) {
  height: 720px;
  padding: 162px 0;
  background: url(/img/case-bg.png) no-repeat center;
  background-size: auto 720px;
}
.main .case:nth-child(even) .cover {
  width: 568px;
  height: 397px;
}
.main .case .cover {
  background: pink;
}
.main .case .content {
  position: relative;
  background: skyblue;
  width: 490px;
  height: 410px;
  margin-top: 50px;
}
.main .case .content img {
  display: block;
  width: 580px;
  height: 516px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.main .case .cover img {
  display: block;
  width: 100%;
  height: 100%;
}

.footer {
  margin-top: 0;
}