added fixes for search bar after downgrading sass version

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Files changed:

• src/current/Gemfile
• src/current/css/bs/_variables.scss
• src/current/css/bs/mixins/_forms.scss
• src/current/css/bs/mixins/_grid.scss
• src/current/css/bs/utilities/_embed.scss
• src/current/css/bs/vendor/_rfs.scss
• src/interactive-tutorials/Gemfile

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