Archived project, now maintained at https://framagit.org/wikimedia-france/campaign-thermometer
A "thermometer" Widget for Wikimédia France’s donation campaign
Create a text widget with the following content:
<p>
<iframe src="https://dons.wikimedia.fr/ext/campaign-thermometer/iframe.php" width="250px" height="320px" frameborder="0"></iframe>
</p>