Fixes insufficient colour contrast on select boxes in Windows 10
Fixes insufficient colour contrast on select boxes in Windows 10

In Windows 10 on Internet Explorer and Edge selected and active
options in select boxes have a light blue visual treatment.
That differes from other browser vendors' implementation and it
it has a contrast ration 2.9:1 which is not accesible.
By applying microsoft only CSS values  using the GOV.UK
blue this has now been fixed.

alphagov/govuk_elements,alphagov/govuk_elements,alphagov/govuk_elements,alphagov/govuk_elements