I am trying to increase the width of labels on my form.

I have set them to the width of the form in the form designer but they are still displaying narrower and wrapping onto multiple lines. They look OK in the editor but change as soon as I preview or publish the form.

The CSS you were using was not properly assigned. I removed the .thankyou selector and now the form's width it is 640px.

Please let us know if you have any other question.