Fix a bug on IE where padding on input meant text was hidden
Fix a bug on IE where padding on input meant text was hidden

# Removing the padding makes the box too small, so instead of padding just
# use an actual height set to be the same overall height as it was.

ucam-cl-dtg/isaac-app,ucam-cl-dtg/isaac-app,ucam-cl-dtg/isaac-app,ucam-cl-dtg/isaac-app