Previous the text input on the send one off SMS page was wrapped in
an element with a class of `form-group`. We overrode the spacing on this
element to make the links under the textbox move closer to the textbox,
so that visually they group together.
This was broken when we moved to GOV.UK frontend, which uses a class of
`govuk-form-group`. This commit changes the CSS to account for both
possibilities, because the send-a-one-off-letter page is still using a
textbox, not a text input, and textboxes haven’t moved to GOV.UK
Frontend yet.
We adjust the spacing under the textbox when doing the send one off
flow. This was based on the assumption that there would always be a
sticky header in the send one off flow.
This assumption is no longer true, so this commit implements the same
spacing in an independent way.