How can change width of right column

Hello.;

I would where can i find to change the width of the right of event in the case of i show a event in details..

in web browser the url is like this..

"events.php?action=show_info&event_id="

Did just change in the sdating.css ?

.cls_info
{
position:relative;
float:right;
width:465px;
overflow:hidden;
}

Thanks..

Ok i've tried this..

and it's ok..

I answer by myself..