Hi,
Sorry for the message in English.
I was finally able to access your website.
First, you had turn off the "Quantity input method" setting of the HikaShop configuration which removed the quantity fields.
Second, you have the margin of that CSS:
textarea, input, input[type="text"], input[type="password"], input[type="datetime"], input[type="datetime-local"], input[type="date"], input[type="month"], input[type="time"], input[type="week"], input[type="number"], input[type="email"], input[type="url"], input[type="search"], input[type="tel"], input[type="color"] {
color: #a8a8a8;
background-color: #ffffff;
border: 1px solid #d5d5d5;
border-radius: 0;
height: 45px;
padding: 0 15px;
margin: 0;
vertical-align: middle;
box-shadow: none;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
in the CSS of your template which messes with the quantity written in the quantity field.
You also want to add the code:
.hikashop_next_product {
width: 19px !important;
height: 19px !important ;
}
on your website to fix the issue with the next/previous buttons.