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    %h1 Hello World!
    %p Lorem ipsum dolor sit amet, consectetur adipisicing elit. Obcaecati incidunt non nam quasi mollitia recusandae harum deleniti hic.



                @import url(',700')

$image_url: ''

@mixin background_overlay($image_url: null, $solid_background: null, $gradient_start: null, $gradient_end: null, $gradient_direction: null)
  $g: linear-gradient(if($gradient_direction == null, null, $gradient_direction + unquote(',')) if($gradient_start == null, transparent, $gradient_start), if($gradient_end == null, transparent, $gradient_end))
  $s: linear-gradient($solid_background 100%, transparent)
  $i: url($image_url)
  @if ($gradient_start == null) and ($gradient_end == null)
    $g: null
  @if $solid_background == null
    $s: null
  @if $image_url == null
    $i: null

  background-image: $g, $s, $i

// Tests
  +background_overlay($image_url: null, $solid_background: null, $gradient_start: '$gradient_start', $gradient_end: '$gradient_end', $gradient_direction: '$gradient_direction')
  +background_overlay($image_url: null, $solid_background: null, $gradient_start: '$gradient_start', $gradient_end: '$gradient_end', $gradient_direction: null)
  +background_overlay($image_url: null, $solid_background: null, $gradient_start: null, $gradient_end: '$gradient_end', $gradient_direction: null)
  +background_overlay($image_url: null, $solid_background: null, $gradient_start: '$gradient_start', $gradient_end: null, $gradient_direction: null)
  +background_overlay($image_url: null, $solid_background: '$solid_background', $gradient_start: null, $gradient_end: null, $gradient_direction: null)
  +background_overlay($image_url: '$image_url', $solid_background: null, $gradient_start: null, $gradient_end: null, $gradient_direction: null)

  box-sizing: border-box
  -webkit-font-smoothing: antialiased

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

  $font_size: 20px
  $line_height: $font_size * 1.5

  // Use it to add a solid overlay to make text more readable on images
  +background_overlay($image_url, rgba(black, 0.25))
  // Use it to add both solid and gradient overlays on images
  +background_overlay($image_url, rgba(blue, 0.25), rgba(blue, 0.5), rgba(red, 0.75), to top right)

  position: relative
  height: 100vh
  background-size: cover
  background-position: center
  color: white
  font-family: 'Montserrat', sans-serif
  font-size: $font_size
  line-height: $line_height

    position: absolute
    top: 50%
    left: 50%
    width: 100%
    max-width: $line_height * 20
    padding: 0 $line_height
    text-align: center
    transform: translate(-50%, 0)
    opacity: 0
    animation: 0.75s 0.75s forwards slide_in

      @keyframes slide_in
          transform: translate(-50%, -50%)
          opacity: 1

  h1, p
    margin: $line_height 0

    font-size: $font_size * 2
    line-height: $line_height * 2
    letter-spacing: $font_size / 2
    text-transform: uppercase

      $height: $line_height / 8
      content: ''
      display: block
      width: $line_height * 4
      height: $height
      margin: #{$line_height - $height / 2} auto #{0 - $height / 2}
      background-color: currentColor