Why there is right margin in Compass CSS Blueprint?

I've use the compass CSS with blueprint for sometimes. I notice there's a right margin with every column in compass CSS.

Is it required? how can I remove it?

Because sometimes it's quite annoying and mess with my design plan.

#hc, #fc {
 开发者_StackOverflow社区   @include column($blueprint-grid-columns);
}

This cause #hc to have a right margin.

I am pretty sure you can just set the column margins via the config variable:

 $blueprint-grid-margin: 10px

See the reference: http://compass-style.org/reference/blueprint/grid/#const-blueprint-grid-margin