Try adding:
box-shadow: none;
border-image: none;
}
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That has worked for all the other buttons in my panel except for the time/date, the colour of the time/date button changes with the other buttons but it seems like there must be another location adding this box-shadow.
I found it, I had to copy panel-button:hover.clock-display line from the gnome-classic.css and change the box-shadow:none
Still a little more tweaking to do but looking closer to how I want it.
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