Summary

Add in Mediawiki:Common.css this:

#BarraLemmi { background-image: url(http://upload.wikimedia.org/wikipedia/commons/6/68/ProgressBarUp.png);}

and in template (used for page counter):

 <div id="BarraLemmi" style="background-repeat:no-repeat; width:{{#expr: ({{NUMBEROFARTICLES}} * 1000 - {{#expr: {{NUMBEROFARTICLES}} -1 round 0}} * 1000) / 20 }}%;">
[[immagine:ProgressBarDown.png]]
 </div>

see: wikt:it:Template:Barra2

Licensing

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You are free:

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• to remix – to adapt the work

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• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
• share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

https://creativecommons.org/licenses/by-sa/3.0CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 truetrue