Edrawsvg is using the w3-theme-blue-grey W3.CSS color theme.

To change it, select a color theme.

Then replace stylesheet import in edrawsvg.html file:

<link type="text/css" rel="stylesheet" href="edrawsvg-app/w3-theme-blue-grey.css"/>

By the selected color theme, for example:

<link rel="stylesheet" href="https://www.w3schools.com/lib/w3-theme-deep-orange.css"/>

The edrawsvg.html file can copied to do this changes.