login AND registration on one page - letters do not fit

-- HikaShop version -- : 3.2.1
-- Joomla version -- : 3.8.2
-- PHP version -- : 5.6.32
-- Browser(s) name and version -- : Firefox 57

After I put a product into the cart I go to the checkout for ordering.

There I have to either login OR to register. Unfortunately it does not look well aligned. I took a snapshot.

You can see what I mean by following the link cd30k.de/index.php/hikashop-menu-for-products-listing/checkout

On the left side you can see "Benutzernam" (with an "e" missing at the end - correct is: "Benutzername").
The same on the right: the word "Benutzername" is shown correct - but is unfortunately a bit positioned into the box for the "Passwort".
At least: the word Registration (right beside "Anmelden") should be positioned far more right.

So finally the question is:
where can I change / adapt the layout for the names and positioning of names and boxes? Do I need to dive into the code or can I adapt this all inside Joomla?

Hello,

So finally the question is:
where can I change / adapt the layout for the names and positioning of names and boxes? Do I need to dive into the code or can I adapt this all inside Joomla?