Remove asterisk in required fields

-- HikaShop version -- : 3.4.0
-- Joomla version -- : 3.8.6
-- PHP version -- : 5.6

Hi,
how is it going?
How can I remove asterisk in Hikashop required fields? (screenshot attached)
I've used these CSS code but it doesn't work:
.star{display:none;}
.form-required { display: none; }

Hello,

Using that king of CSS code will probably do the job :

.hikashop_field_required_label {
display: none;
}