I'm sorry I didn't solve this topic. But I made it responsive for my specific needs.
This is my own responsive.css file, it works very well but was a little work to set it !
Hope that's helpy.
@media(max-width: 980px){
.devis cck-f100 cck-pad-8{
-webkit-columns: 1;
-moz-columns: 1;
columns: 1;
}
.cck-fr {float: left; width:77%;
}
.cck-70 cck-fl cck-ptb cck-body {float:left; width:80%;
}
}
@media(max-width: 425px){
#nom,
#prenom,
#adresse,
#adresse_electronique,
#telephone,
#description_du_projet,
#plan_croquis,
#photo_1,
#photo_2,
#photo_3,
#video_1,
#video_2,
#confirmation,
#longueur,
#largeur,
#surface_en_m2,
.icon-calendar
{
width:85%;
}
#nature_du_projet_reel{
width:100%;
}
}
@media(max-width:485px){
#date_du_projet{
width:40%;
}
}