If there will always be two columns and the content is always in the left or right column, you can use float right on the 2nd column and that would resolve the issue.
.container > .content-box:nth-child(odd) {float:left}
.container > .content-box:nth-child(even) {float:right}
In the future, CSS Flexbox will resolve this issue; however, it isn't well supported as of yet.
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