.model-list-21 {
  padding-top: 50px;
  padding-bottom: 50px;
}
.model-list-21 .main {
  display: flex;
  justify-content: center;
  align-items: center;
}
.model-list-21 .main .item {
  width: 305px;
  height: 110px;
  float: left;
  font-size: 18px;
  line-height: 1.5;
  color: #333333;
  text-align: center;
  transition: .5s;
  margin: 30px 70px 0 70px;
  cursor: pointer;
  padding: 10px;
  border-radius: 15px;
}
.model-list-21 .main .item:first-child {
  margin-left: 0;
}
.model-list-21 .main .item:last-child {
  margin-right: 0;
}
.model-list-21 .main .item .word {
  margin-top: 25px;
  margin-left: 90px;
}
.model-list-21 .main .item .word .span {
  text-align: left;
  font-size: 20px;
  font-weight: 600;
  color: #25272A;
  line-height: 28px;
}
.model-list-21 .main .item .word .subtitle {
  text-align: left;
  font-size: 14px;
  font-weight: 400;
  color: #555C66;
  line-height: 20px;
}
.model-list-21 .main .item .images {
  float: left;
  width: 75px;
  height: 75px;
  margin: 0 auto;
  position: relative;
}
.model-list-21 .main .item .images img {
  top: 0;
  left: 0;
  transition: .5s;
}
.model-list-21 .main .item .images .m {
  opacity: 0;
}
.model-list-21 .main .item:hover {
  background: rgba(235, 235, 245, 1);
  transition: .5s;
}
.model-list-21 .main .item:hover .images img {
  transition: .5s;
}
.model-list-21 .main .item:hover .images .m {
  opacity: 1;
}
.model-list-21 .main .item:hover .images .n {
  opacity: 1;
}