Hover effect color for "Full list of releases" button is low contrast

This bug has been copied automatically from: https://bugs.launchpad.net/qemu/+bug/1822798

The hover effect of "Full list of releases " on QEMU website that is
https://www.qemu.org/ is not visible and hence effective so made it the
issue on git hub and even committed it.

Edited May 03, 2021 by John Snow

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