.grid {
  margin-left:4%;
}
.grid:after {
  content: '';
  display: block;
  clear: both;
}
@media (min-width:300px){.ul_thumb{width:97%;margin:5px}}
@media (min-width:768px){.ul_thumb{width:46%;margin:5px}}
@media (min-width:1100px){.ul_thumb{width:30%;margin:5px}}
@media (min-width:1300px){.ul_thumb{width:22%;margin:5px}}
@media (min-width:1600px){.ul_thumb{width:18%;margin:5px}}