Title in registration form is too wide

-- url of the page with the problem -- : softdune.com/index.php/en/hika-registration-form
-- HikaShop version -- : 4.2.3
-- Joomla version -- : 3.9.16
-- PHP version -- : 7.3.4
-- Browser(s) name and version -- : Chrome 73.0.3683.103 

How can I control the size of the fields in the registration form.
My title and my country drop down's are too wide.