*, *:before, *:after
  box-sizing border-box

body
  font-family Arial, Helvetica, sans-serif
  color #333
  background-color #fff
  margin 0
  padding 0

header
  color #fff
  background #0066bb url(../images/reactjs.png) no-repeat right 10px
  background-size contain
  h1
    display inline-block
    padding 0 20px
  a
    display inline-block
    margin 10px
    padding 10px
    color #fff
    text-decoration none
    border-radius 3px
    &.active,
    &:hover
      background-color #0085F3

section
 padding 20px

*, *:before, *:after
  box-sizing border-box

body
  font-family Arial, Helvetica, sans-serif
  color #333
  background-color #fff
  margin 0
  padding 0

header
  color #fff
  background #0066bb url(../images/reactjs.png) no-repeat right 10px
  background-size contain
  h1
    display inline-block
    padding 0 20px
  a
    display inline-block
    margin 10px
    padding 10px
    color #fff
    text-decoration none
    border-radius 3px
    &.active,
    &:hover
      background-color #0085F3

section
  padding 20px

Fix indentation on section in default stylesheet
Fix indentation on section in default stylesheet