[Plugin: Campaign Monitor Ajax Forms] Plugin appearance in WordPress sidebar

Loving the plugin. Working a treat for me except in one way. If put into custom sidebar on RHS of page, all is good – http://therealasset.co.uk/research-and-analysis/. But, if put into custom sidebar in LHS of page, the field bars are too long and end up getting broken. This is an example I’m having – http://therealasset.co.uk/about/who-we-are/

Any thoughts on this? Am I able to change width of fields?