Scroll 'Coy' background with contents (#1163)
Scroll 'Coy' background with contents (#1163)

* Scroll 'Coy' background with contents

Attaches <pre> background (alternating line colors in 'Coy') to <code> contents when in limited-height <pre> that requires scrolling.

* Moves background to <code> element

Move background from <pre> element to <code> element to preserve <pre> drop-shadows while keeping background attached during scroll.

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