@Eric: I managed to get it working. This is what is used:
@mixin update-container {
@include container;
@include susy-grid-background;
}
.page {
@include update-container;
@include at-breakpoint(865px 8 1149px) {
@include update-container;
}
@include at-breakpoint(1150px 12) {
@include update-container;
}
}
So I've explicitly described the min- and max widths to tell the columns when to change. Is this the "right" way to go or is there any more elegant way for solving this?
Thanks :)