.top-cat {
  width: 200px;
}

.bnr_list {
    position: relative;
    display: flex;
    margin: 0 0 20px 0;
    padding: 0;
    list-style-type: none;
    flex-wrap: wrap;
}
.bnr_list li {
  position: relative;
  float: left\9;
  width: 50%;
  padding: 10px 5px 0 0;
  box-sizing: border-box;
  transition: opacity .2s;
  text-align: center;
}

.bnr_list li:nth-child(2n) {
  padding: 10px 0 0 5px;
}