Thin gray/black lines on web page viewed with iPad

Question

We\'re finding the the iPad is displaying thin grey/black lines on our site. It seems to be some form of scaling-artefact on mobile Safari. I\'ve provided two snippets of

Answer 1

I had a greyish line (iPad only) at the bottom of my header bar and fixed it with:

position:relative;
z-index:2;

directly added to the header container. perhaps this could also help out someone.