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You can adjust the "Running total" box by using a custom CSS code, in my case, I'll use the Form Designer Tool and inject the CSS code there. You can follow the quick steps below.
1. First, open your Form Designer Tool.
2. Here, double click on the text box you want to adjust the width. We want to double click on it to get it's field ID, in my case the field ID for the "Running Total" is #input_136. Here's my custom CSS code:
width : 200px !important;
You can follow the screenshot below. Now you can adjust the width depending on your own preferences.
Another way to get the field ID is checking the fields properties. Here's a guide that you can follow: http://www.jotform.com/help/146-How-to-find-Field-IDs-Names
I hope that helps.