layout is not fixed

[gam-phon]

layout is not fixed. for example:

<div class="columns">
        <div class="four-fifths column">
           <!-- header -->
        </div>
        <div class="one-fifth column">
            <!-- account -->
        </div>
</div>

When there is no contents in then will be on the left not on the right

[mdo]

Yes, there is no min-height or anything like that to ensure an empty <div> doesn't collapse. We have no plans to add that to Primer either—Bootstrap has it though—since all our columns are essentially guaranteed to have content in them.

I'd suggest that if you have no content within the column, you simply remove it.