There are several ways to do this, but perhaps the easiest is this.
1. Download and activate this plugin.
2. I suggest using Firefox as your browser, but Chrome and Opera work well too. Now go to the page where the widget appears and right-click on the text whose size you want to change.
3. Click Inspect Element.
4. You will now find that, among other things, a tooltip has now appeared, pointing to the text. Click the downward arrow on the right of the tooltip, and then click Copy Unique Selector.
5. Open the Custom CSS plugin that you downloaded in step 1, and paste what you have copied into it. Then follow it with this:
{ font-size: 14px;}
Then save. (In case you are wondering, 14px is about the same size as 12pt.)
6. Refresh the page in your website where you were trying to make the change.
