.top-link-list.sub2 ul li {
   width:200px;
   float:left;
   margin:0 8px 0 0;
}

@media screen and (max-width: 768px) {
  .top-link-list.sub2 ul li {
   margin:0;
   width:100%;
  }
}
.top-link-list.sub2 ul li:nth-child(3) {
   margin-right:0;
}
.top-link-list ul li img {
   width: 100%;
   height: auto;
}