Hi,
In the documentation that Xavier gave you, there is a part which explain how override the HikaShop CSS file.
That is in that interface where you should put your specific CSS content.
You will see some "examples" in the front-end CSS of HikaShop like
@media only screen and (max-width: 480px) {
table#hikashop_cart_product_listing tbody td:nth-last-child(1),
table#hikashop_cart_product_listing th:nth-last-child(1),
table#hikashop_clicks_listing tbody td:nth-child(1),
table#hikashop_clicks_listing th:nth-child(1),
table#hikashop_clicks_listing tbody td:nth-last-child(1),
table#hikashop_clicks_listing th:nth-last-child(1),
table#hikashop_sales_listing tbody td:nth-child(1),
table#hikashop_sales_listing th:nth-child(1),
table#hikashop_sales_listing tbody td:nth-last-child(1),
table#hikashop_sales_listing th:nth-last-child(1),
table#hikashop_leads_listing tbody td:nth-child(1),
table#hikashop_leads_listing th:nth-child(1),
table#hikashop_leads_listing tbody td:nth-last-child(1),
table#hikashop_leads_listing th:nth-last-child(1) {display: none;}
}
Which is some CSS rules to hide some table columns depending the size of the screen.
Regards,