Hi Alison,
Follow these steps to change color of the Soma: Text Widget content
Step 1) First of all, Open the Soma: Text Widget and wrap the content inside <p></p>
tag
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Step 2) Find the Widget ID. Go to your page (front view) and right-click on page to Inspect the HTML.
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Step 3) Copy the widget ID for eg pgc-22-1-0
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Step 4) Go to Appearance -> Customize -> Additional CSS and write CSS
For eg #yourwidgetid p{ color: hexcode; }
For this case #pgc-22-1-0 p{ color: #ff0000; }
Step 5) Save & Publish
Note: You can search for color picker to get hex codes
Regards