.card-layer {
  background-color: #fff;
  margin-bottom: 20px;
}

.filter {
  text-align: center;
  padding: 20px;
}

.card-layer h2 {
  text-align: center;
  padding: 15px 0;
  font-size: 20px;
}

.case-layer {
  height: 1200px;
  overflow: hidden;
  padding: 10px 0;
}

.case-layer > div {
  width: 50%;
  height: 50%;
  float: left;
}

.case-layer > div:nth-child(3) {
  width: 100%;
}