Generated by SassMeister.com.

SassMeister-input-HTML.html

<header>
  header
</header>

<nav>
  nav
</nav>
<article>
  article
</article>
<footer>
  footer
</footer>

SassMeister-input.scss

// ----
// Sass (v3.3.7)
// Compass (v1.0.0.alpha.18)
// Breakpoint (v2.4.2)
// Susy (v2.1.2)
// ----

@import "compass"; 
@import "compass/reset";
@import "breakpoint";
@import "susy";

@include establish-baseline;

$susy: (
  columns: 4, 
  gutter-position: inside-static, 
);

$mid: (
  columns: 6, 
  gutter-position: inside-static, 
);

$large: (
  columns: 12, 
  gutter-position: inside,
);


body { 
  @include container( show); 
  @include susy-breakpoint(800px, $large show) {
  }
  @include susy-breakpoint(850px, $mid show){
  }
}
  
header { }
nav { }
article { }
footer {  }

header, nav, article, footer {
  background: pink;
 
}

SassMeister-output.css

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  font: inherit;
  font-size: 100%;
  vertical-align: baseline;
}

html {
  line-height: 1;
}

ol, ul {
  list-style: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

caption, th, td {
  text-align: left;
  font-weight: normal;
  vertical-align: middle;
}

q, blockquote {
  quotes: none;
}
q:before, q:after, blockquote:before, blockquote:after {
  content: "";
  content: none;
}

a img {
  border: none;
}

article, aside, details, figcaption, figure, footer, header, hgroup, main, menu, nav, section, summary {
  display: block;
}

html {
  font-size: 100%;
  line-height: 1.5em;
}

body {
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
  background-image: -moz-linear-gradient(left, rgba(102, 102, 255, 0.25), rgba(179, 179, 255, 0.25)), -moz-linear-gradient(top, rgba(0, 0, 0, 0.5) 5%, rgba(0, 0, 0, 0) 5%);
  background-image: -webkit-linear-gradient(left, rgba(102, 102, 255, 0.25), rgba(179, 179, 255, 0.25)), -webkit-linear-gradient(top, rgba(0, 0, 0, 0.5) 5%, rgba(0, 0, 0, 0) 5%);
  background-image: linear-gradient(to right, rgba(102, 102, 255, 0.25), rgba(179, 179, 255, 0.25)), linear-gradient(to bottom, rgba(0, 0, 0, 0.5) 5%, rgba(0, 0, 0, 0) 5%);
  background-size: 25%, 100% 24px;
  background-origin: content-box, border-box;
  background-clip: content-box, border-box;
  background-position: left top;
}
body:after {
  content: " ";
  display: block;
  clear: both;
}

header, nav, article, footer {
  background: pink;
}

SassMeister-rendered.html

<header>
  header
</header>

<nav>
  nav
</nav>
<article>
  article
</article>
<footer>
  footer
</footer>