index.css

* {
  box-sizing: border-box;
}
ul,li{
  list-style: none;
  margin: 0;
  padding: 0;
}
.img_list{
margin-top: 50px;
}
.img_list ul {
  display: flex;
  flex-wrap: wrap;
  width: 1200px;
  margin: 0 auto;
}
.img_list ul li{
  width: 300px;
  text-align: center;
}
.img_list ul li img{
  transition: all 0.3s;
}
.img_list ul li img:hover{
  transform: scale(1.1,1.1);
}
@media screen and (max-width: 700px) {
  .img_list ul {
    width: 600px;
  }
}

.show{
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.4);
  display: none;
}

.show .show-box{
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
  width: 600px;
  height: 400px;
  background-color: #fff;
  z-index: 999;
}
.show .show-box .img-introduce{
   position: absolute;
   left: 250px;
   top: 50px;
}