• GH-2105: Sync button hover states in the hub (#607)

    * Add and use mixin for button hover backgrounds in the hub
    
    * Remove mixin...Use sass
    
    * Use color variable in hub
    
    Co-authored-by: wlycdgr <ilya.zarembsky@gmail.com>
    benstrumeyer and wlycdgr committed Sep 25, 2020