how can i adjust width of text fields?

I increased input width in the extended form designer, saved it, but it does not show in the normal form builder nor in the preview.

this screenshot is from the advanced builder:

You can inject a custom CSS to adjust the width of input fields. Please use the code below and follow the guide below it:

.form-textbox {
    width : 200px!important;
}

GUIDE: How-to-Inject-Custom-CSS-Codes

1. In the form builder, click the Design icon.

2. Click on the CSS tab, and paste the code in the "Inject Custom CSS" area.

3. Make sure to click on the Save button.