You need to make 3 CSS changes to do this (in style.css or your child theme stylesheet):
Change #1: Wrapper (.wrapper, line 188):
.wrapper {
position: relative;
width: 1160px;
max-width: 86%;
margin: 0 auto;
background: url('images/1px-white.png') left repeat-y;
background-size: 68% auto;
}
Change #2: Content (.content, line 203):
.content {
position: relative;
width: 68%;
float: left;
background: #FFF;
z-index: 2;
}
Change #3: Sidebar (.sidebar, line 197):
.sidebar {
width: 32%;
float: right;
margin: 7.5% 0;
}
