bdot

In a multi-column layout, the container seems to be automatically taking all the available page space [FlowingColumnContainerBox](https://github.com/danfickle/openhtmltopdf/blob/f7d6f552367572e36e37d87b179a8ae81a653ef7/openhtmltopdf-core/src/main/java/com/openhtmltopdf/render/FlowingColumnContainerBox.java#L32). Is there any way to restrict the height?