Hi
You can change it managing this file templatesja_brisktplsblocksmainbody.php
"two_sidebars": {
"default" : [ "span6 offset3" , "span3 offset-9" , "span3" ],
"wide" : [],
"xtablet" : [],
"tablet" : [ "span12" , "span6 spanfirst" , "span6" ]
},
"one_sidebar1": {
"default" : [ "span8 pull-right" , "span4" ],
"wide" : [],
"xtablet" : [ "span8 pull-right" , "span4" ],
"tablet" : [ "span12" , "span12 spanfirst" ]
},
"one_sidebar2": {
"default" : [ "span8" , "span4" ],
"wide" : [],
"xtablet" : [ "span8" , "span4" ],
"tablet" : [ "span12" , "span12 spanfirst" ]
},
"no_sidebar": {
"default" : [ "span12" ]
}
Changing the value of span(n) to enlarge or reduce the width