@jp_grennier: You can check that from your responsive.css file.
@media screen and (min-width: 1190px) { }
@media screen and (max-width: 1060px) { }
@media screen and (max-width: 960px) { }
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : portrait) { }
@media screen and (max-width: 767px) { }
@media only screen and (min-width: 480px) and (max-width: 767px) { }
@media screen and (max-width: 480px) { }
@media screen and (max-width: 320px) { }