Hi Hank,
Try chrome without any add-ons active, that works usually the best.
The box color can be affected by these two options:
– Overall box layout color: https://i.imgur.com/NH5xg9S.png
– Input field color (same as the box): https://i.imgur.com/wgPlVNx.png
Sometimes the input field color covers the whole box, if the margin low, so changing that will actually change the box color as well.