edit subcontainer

You don't need to change CSS for that.
The subcontainer width is automatically calculated by your browser based on the number of columns and the margin settings of your menu/module. Just change them to adapt to what you want.

Go in the hikashop options of your products listing menu/module and increase the "number of columns" option.

Can you do a screenshot of the options of your menu/module ?
Could you give a link to that page ?
That would allow us to see if you did it properly.
For the payment methods, if you don't see them during the checkout, you should check that FAQ:
www.hikashop.com/en/support/documentatio...ins-listing.html#faq

Go in the menu Display->Content menus and edit the menu with the id 544. There, reduce the number of columns and it should display better on that page:
www.artgergasi.com/index.php/order-now

I can see your PayPal plugin before login but not after.
It means that you either restricted your payment method to shipping methods AND/OR you restricted to only some zone.
Remove these restrictions in the options of the payment plugin and it will display.

For the information changing per characteristic value, you can create a characteristic, associate it to your product and then edit each variant to modify the information for each variant of the product. More information here:
www.hikashop.com/en/support/documentatio...html#characteristics

1. It's because your emails settings are not configured properly, either in the joomla configuration, or in the hikashop configuration.
Either fix your email settings or disable the activation email (it's an option in the joomla user manager).

2. Could you do a screenshot of your shipping methods and more information of the weight you set in your products and what product you had in the cart when you got that error ?

Please check that you set a weight in your product and if that doesn't work in each one of the variants (via the "manage variants button"). That should help avoid that error message.

If you want your users to upload pictures when buying your products, you can create a custom field of the table "item" via the menu Display->Custom fields in the business edition.

If it shows the "no value found" message you should follow that step by step:
1. Delete all the variants of the product on the listing of variants that you can access via the button "manage variants" on the product edition screen.
2. Delete the characteristics of the product.
3. Save the product.
4. Add the characteristics again.
5. The system will regenerate all the variants automatically and you should be able to see the dropdowns properly on the front end.

The business edition is installed on our demo website:
demo.hikashop.com
You can try it there.