.banner img{
  width: 100%;
}
.csts-box{
  padding-bottom: 33px;
  padding-bottom: .33rem;
  margin-top: 23px;
  margin-top: .23rem;
}
.csts-item{
  display: block;
  margin-bottom: 40px;
  margin-bottom: .4rem;
  position: relative;
  margin-right: 40px;
  margin-right: .4rem;
  width: 580px;
  width: 5.8rem;
}
.csts-item img{
  width: 100%;
}
.csts-item:nth-of-type(2n){
  margin-right: 0;
}
.csts-item-ct{
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  padding: 50px;
  padding: .5rem;
  box-sizing: border-box;
  line-height: 40px;
  line-height: .4rem;
  font-weight: bold;
  font-size: 34px;
  font-size: .34rem;
  color: #FEFFFF;
  text-shadow: 0 5px 5px rgba(13,115,139,0.74);
  text-shadow: 0 .05rem .05rem rgba(13,115,139,0.74);
}
@media screen and (max-width: 768px) {
  .centerWidth{
    padding: 0 25px;
    padding: 0 0.25rem;
    box-sizing: border-box;
  }
  .csts-item{
    width: 100%;
    margin-bottom: .32rem;
  }
  .csts-item{
    margin-right: 0;
  }
  .csts-item-ct{
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
}