Merge pull request #8397 from KDSBrowne/update-whos-talking

bigbluebutton-html5/imports/ui/components/app/styles.scss

...luebutton-html5/imports/ui/components/nav-bar/styles.scss

...ports/ui/components/nav-bar/talking-indicator/styles.scss

...n-html5/imports/ui/stylesheets/variables/breakpoints.scss

...on-html5/imports/ui/stylesheets/variables/typography.scss