#top-bn{
  max-width:980px;
  overflow:hidden;
  margin-bottom: 30px;
}
.top-bn1{
  width:49%;
  float:left;
}
.top-bn2{
  width:49%;
  float:right;
}
@media (max-width: 768px) { 
#top-bn {
    padding: 0 10px 20px;
}
}