How can I change the only one textbox size in a Configurable List widget

How can I change the only one textbox size in a Configurable List widget.

As the first box is quantity, needing only 3 digits and the other is a description needing more? 

Sorry, I do not understand which field you want to change the size to, do you want to change the size to the "Quantity" or "Description or Cat No." field? 

Please kindly let us know so we can provide you with the needed code for that. 

Also, for the quantity field you may instead use a text box, this guide will help you setting up the widget: https://www.jotform.com/help/282-How-to-Set-Up-the-Configurable-List-Widget 

We will wait for your response. 

Hi

the first field, Quantity

Inject this code to change the element size: 

td.col1 textarea {

    width: 25px;

    height: 25px;

}

You can change the 25 value according to how you want the field to be displayed, this guide will help you injecting the code to your widget: https://www.jotform.com/help/428-How-to-Inject-CSS-Codes-to-Widgets