Change a column width of a list field

Hi, hoping for some advice please. I have many list fields in my home insurance quote forms. Some have 2 columns, others have 3 and 4. Therefore think I’d need to pinpoint each form ID, list field and column individually. That’s a fair bit of code to put into the built-in CSS editor.
Done some Googling and found the bit of code below. For example if I wanted to apply this to form ID 1, list field 128, column 2 how would I change the code? Thanks.

body .gform_wrapper table.gfield_list tr td.gfield_list_128_cell2 {
width: 40px!important;
}