DataTable dimension size (no replies)

Hi,

I have a DataTable with a subTable.
Here :
[attachment 2255 Capturedecran2015-04-08a11.33.15.png]

With the subTable :
[attachment 2256 Capturedecran2015-04-08a11.37.17.png]

My problem is the size dimension of the DataTable.

I would like to have a 100% width attribut css. It's possible ? How ?

Can I override the css DataTable class ? or simply change an attribut on my view ?

Thanks in advance,