How to increase the width of some of the text input boxes individually in the configurable list?

Secondly, I'd like to increase the width of some of the text input boxes individually in the configurable list, but not all of them globally.

The width of text fields is set on the Configurable List of your form to 80px:

You can add css code to set different width for specific elements. For example, to increase the width for 4th text field, use the following:

 

.col4 > input {width: 150px !important;}

If you need more help, please provide us more requirements on which fields you want to style.

@Victoria_K You're always such a great help, thank you!!