Quick and dirty fix for context menu

[judemille]

This will make the page longer, thus allowing space for the context menu to appear if dealing with a container at the bottom of the page.

[tombee]

@firefaced
Thanks for the fix, I think we probably need to add this either to the semantic theme's source.. or as a quick fix in https://github.com/shipyard/shipyard/blob/master/controller/static/main.css if you prefer.

I'm afraid that modifying this minified and generated file might mean that the change will be lost in future builds.

[judemille]

@tombee Yeah, I just put it there, because that's where the UI pulls from. You can see the modified code though, so if you want, you can put it where it needs to go.