[@robin-w Moderator 9 years, 4 months ago]

ok that’s firmly theme related, but I’ll give you a starter and let you play

Put this in your theme’s custom css area, presuming it has one

.section-inner {
  width: 1200px;
}

.content {
  width: 65%;
}

.sidebar {
  width: 27.5%;
}

and then just play with the numbers to get what you want