Hi there, while changing column sizes can be done, it can be a tricky thing to do as changing one column size in turn affects others.
The main column – an ID called primary – is defined by this CSS:
#primary {
float: left;
margin: 0 -270px 0 0;
width: 100%;
}
The overall container is defined through this CSS:
#page {
background-color: #fff;
display: block;
margin: 0 auto;
padding: 41px 20px 0;
width: 960px;
}
Try adjusting things by adding this to your custom CSS, to gain the extra 80px of width in the main column:
#page {
width: 1040px;
}