rustdoc: clean up help and settings button CSS #105155
Merged
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The old version of this code specified a bunch of different numbers that had to line up just right to get the size it wanted. This version uses flexbox centering, specifies the font size, and lets the browser figure out the rest of the layout automatically.
Preview: http://notriddle.com/notriddle-rustdoc-demos/flexbox-help-settings-buttons/test_dingus/