.publication ul {
  width: 100%;
}
.publication li {
  display: inline-block;
  margin-bottom: 30px;
  width: 19%;
}
.publication li .imgbg {
  width: 85%;
  border: 1px solid red;
  padding: 5px 5px 0 5px;
}
.publication li img {
  width: 100%;
}
@media screen and (max-width: 1000px) {
  .publication li {
    width: 49%;
  }
  .publication li .imgbg {
    width: 100%;
  }
}