How to change the with of the input table field?

hi, 

how to "normalize" or align the width of these two tables ?

How can we control and change the width of the first column (headers) in CSS ?

Please inject the following custom css code in your form to change the width of the input table value column:

.form-matrix-values {

    width: 400px !important;

}

The following guide should help you how to inject custom css code in form:   https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes