.caseBox{
  padding-bottom: 20px;
}
.caseList{
  display: flex;
  flex-wrap: wrap;
}
.caseList .caseItem{
  width: 20%;
  padding: 20px;
  box-sizing: border-box;
  text-align: center;
}
.caseList .caseItem img{
  max-width: 100%;
}

@media screen and (max-width: 800px) {
  .caseList .caseItem {
    width: 50%;
  }
}