problem with box quantity

Hi,

The issue comes from the padding added by the CSS of your template.
You can potentially increase the width of the input with such CSS:
input.hikashop_product_quantity_field {
width: 45px !important;
}
You can add it as explained here:
www.hikashop.com/support/documentation/1...ize-the-display.html

Also, regarding the centering, the issue is that you're using the "image and description" layout in your menu item instead of "image and title" and your thumbnail size is too big.
You can change that under the "product options" tab of your menu item in the Joomla menu manager.

Hi,

Sure. You can simply use such CSS on your website:
.hikashop_products_listing .hikashop_product_stock{
margin: auto;
width: 50%;
}