Thanks, Arun!I checked and saw grid.less is included in css.txt.Here is my grid.less:.aem-Grid {.generate-grid(default, @max_col);}@media (min-width: 1200px) {.aem-Grid {.generate-grid(lg, @max_col);}}@media (min-width: 992px) {.aem-Grid {.generate-grid(tablet, @max_col);}}@media (max-width: 768px) ...