Susy version 1:
```css
// http://susy.oddbird.net/tutorial/
@import "susy/sass/_susy"
@include border-box-sizing
$show-grid-backgrounds: true
// Mobile-first grid
$total-cols : 4
$col-width : 4em
$gutter-width : 1em
$side-gutter-width : $gutter-width
$container-style : static
// Tablet grid
$tablet-cols : 10
// 768px
$tablet-width : 48em
$tablet : $tablet-width $tablet-cols
$desktop-cols : 12
// 960px
$desktop-width : 60em
$desktop : $desktop-width $desktop-cols
.container
// Tell susy we have 3 different layouts
@include container($total-cols, $tablet-cols, $desktop-cols)
@include susy-grid-background
// Mobile phones
#content
@include span-columns(4, 4)
#sidebar
@include span-columns(4, 4)
// Tablets
@include at-breakpoint($tablet)
@include container
#content
@include span-columns(7, $tablet-cols)
#sidebar
@include span-columns(3 omega, $tablet-cols)
// Desktops
@include at-breakpoint($desktop)
@include container
#content
@include span-columns(8, $desktop-cols)
#sidebar
@include span-columns(4 omega, $desktop-cols)
```
Susy version 2????