- Drops the absolute positioning of the icons within the left/right controls. We have to keep the controls themselves positioned though since we're overlapping HTML elements here.
- No more position, left, right, or margins involved; just some justify-content and align-items.
- Add some comments for explaining which flex property-value pair does what.
- Remove the unapplied font and line-height stuff now that we're all SVGs and flexbox here.
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