I found a similar code in the template, and addedbelow, but nothing has changed - products is displayed in 3 columns:
/* Only Phones and Tablets (Portrait) */
@media (max-width: 959px) {
.span4 {
width:100%;
}
}
/* Only Tablets (Portrait) */
@media (min-width: 768px) and (max-width: 959px) {
.span4 {
width:100%;
}
}
/* Only Tablets (Portrait) and Phones (Landscape) */
@media (min-width: 480px) and (max-width: 959px) {
.span4 {
width:100%;
}
}
/* Only Phones */
@media (max-width: 767px) {
.span4 {
width:100%;
}
}
/* Only Phones (Landscape) */
@media (min-width: 480px) and (max-width: 767px) {
.span4 {
width:100%;
}
}
/* Only Phones (Portrait) */
@media (max-width: 479px) {
.span4 {
width:100%;
}
}