how put the registration box under the login box

-- HikaShop version -- : 3.2.0
-- Joomla version -- : 3.8.0
-- PHP version -- : 7.0
-- Browser(s) name and version -- : Firefox 55.0.3

hi,
I would like to have the registration box under the login box
For my site I am using the guest registration option.

I already tried the css change like in the documentation: www.hikashop.com/support/documentation/8...ing.html#address_box
How to move the registration box below the login box on the checkout
You need to edit the CSS of HikaShop via the interface in the configuration under the tab display in the CSS area and change the code:

.hikashop_checkout_login_right_part {
width: 440px;
float: left;
}
to:
.hikashop_checkout_login_right_part {
width: 440px;
}

but the registration part is still in the right. The fields just are a bit more narrow and smaller when i do it.

Thanks for your help
regards,
Simone

here the test-URL for the shop:
test08052017-9888894sw.webtech-websolutions.de/
test08052017-9888894sw.webtech-websoluti...rzen/kerzen/checkout
If you put a product in the cart, than you can open the checkout.
the attached css-file (here as txt file) I am using in hikashop Frontend-CSS

regards,
Simone