td border disappears when applying transform translate

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I am building a table with a fixed header and a fixed first column.

The header and column stay fixed by applying transform translateX/Y on the scroll event.

When the page loads, the borders are visible on the top row but once you scroll down a little bit they disappear.

What CSS do I need to not let the border disappear?

A plunker with the source can be found here.

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