hs business filter module

Is it possible to change the width of the horizontal filter input? These blocks seems not to be responsive which is affecting the layout of my site.

..... how to??

it's not possible in the module itself neither in the css file (couldn't find it with firebug)

Hi,

You should find it with firebug, all the elements are displayed.
The property should be:

.hikashop_filter_filterName input{
    width: 200px !important;
}

could you please tell me in which file (including the path) i can add this?

You can add this in the frontend css file via the menu Configuration > Display > CSS, click on the edit icon next to "frontend css file".

is it correct that i have to add this myself? because now it isn't in the frontend css file.

If so, can i place the appropriate code at the end of the css file? or do i have to put it at a particular place?

Yes you have to add it yourself in this file.
You can add the css property where you want, at the end is a good choice.