Try this code:
Code:
ul.subcategory-view-icons.subcategory-list.grid-list li {
width: 20%;
}
ul.subcategory-view-icons.subcategory-list.grid-list li:nth-child(2n) + li {
clear: none;
}
ul.subcategory-view-icons.subcategory-list.grid-list li:nth-child(3n) + li {
clear: none;
}
ul.subcategory-view-icons.subcategory-list.grid-list li:nth-child(4n) + li {
clear: none;
}