[TYPO3] login input text size

[Ilaria De Marinis]

Hi list,
I protected some pages in my web site.
I worked out this issue with a mechanism of authentication by user name 
and password.

The simple "Login" content is compliant my needs.
Now I would like to customize the form in html, I just like to change 
the "size" in the two input type text to specify "User" and "Password".
I tried with this command in the template setup, but nothing has changed:
tt_content.login.20.dataArray.10.size=10

Could you please give me and advice to reach my goal?
Many thanks
Best regards

Ilaria

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Ilaria De Marinis 
Settore Automazione Biblioteche
Phone: +3906-44486052
CASPUR - Via dei Tizii ,6 - 00185 Roma
e-mail: ilaria.demarinis at caspur.it
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