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CSS Base

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  a.main-nav__item(href='/') Home
  a.main-nav__item--featured(href='/specials') Specials
  a.main-nav__item--featured--xmas(href='/xmas') Xmas
  a.main-nav__item--xmas(href='/santa') About Santa
              // All blocks and elements require a class name

  margin 0 6px
  padding 0 6px

// By using the CSS attribute selector we can attach as many modifiers as we like onto the base class name. This shortens 'main-nav__item main-nav__item--featured main-nav__item--christmas' to simply 'main-nav__item--featured--xmas'

// `featured` modifier
  font-weight bold

// `xmas` modifier
  background green
  color red
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