How do I make the price input field size bigger?
It is now 38px - I want to make it 50px.
I cannot find any class or CSS file for this.
See attached image.

Dear Koos
edit style /modules/mod_sj_vm_filter/assets/css/styles.css
.sj-vm-filter .ft-content-prices .ft-price-value input[type="text"] {width:50px;}
Thanks

I found the setting - but it is not in the CSS file!
Your SJ Market II template, it is hard coded in;

templates\sj_market\html\mod_sj_vm_filter\default_js.php
Line 100
$('.sj-vm-filter .ft-content-prices .ft-price-value input[type="text"]').css('width','38px');

I have now removed the ('width','38px') part - the width can now be controlled from the CSS file you mentioned.