How do I adjust text box widths within the columns of a Matrix?

Hi, I'm using text boxes within a Matrix. I've figured out how to change the column width, but it doesn't seem to affect the width of the text boxes themselves. Since most of these fields have to do with schools, degrees, or job descriptions, I need the text boxes to be more than 10 characters in length. I don't know code but I catch on pretty quickly if you can tell me what goes where. How do I adjust this?

Thanks for your help!

Kathy

Please try this CSS code 

.form-matrix-values .form-textbox {

width: 100px !important;

}

You can adjust the 100px to your preferred widht.

Hope this help. Let us know if this did not work.

Thanks for your help. How do I get to the Design section where this CSS code should go?
...

Use the Form Designer

 

in the Form Designer follow the number to click the options on the image below

Let us know if you need more help.