If you wish to add rounded corners to an image in Learnifier (either in an activity or in an email template), you must first add the image as a URL.
Add a new text component and click on the image icon in the grey menu.
Add the URL and click OK.
Click on “Source” in the grey menu.
In the style tag, add the following:
border-radius: 25px !important;"
The final code should look like this:
<p><img alt="" img="" src="{image url} " style="width: 100%; height: 100%x; border-radius: 25px !important;" /></p>
All done!