SASS

installation.sh

# install sass on windows
gem install sass

# ensure root permissions on -ix systems using sudo
sudo gem install sass

# check the installation by querying for the current SASS version
sass -v

mixins.css

.panel {
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  -ms-border-radius: 5px;
  -o-border-radius: 5px;
  border-radius: 5px; }

header {
  -webkit-border-radius: 3px;
  -moz-border-radius: 3px;
  -ms-border-radius: 3px;
  -o-border-radius: 3px;
  border-radius: 3px; }

footer {
  -webkit-border-radius: 3px;
  -moz-border-radius: 3px;
  -ms-border-radius: 3px;
  -o-border-radius: 3px;
  border-radius: 3px; }

.advertisement {
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  -ms-border-radius: 5px;
  -o-border-radius: 5px;
  border-radius: 5px; }

mixins.scss

@mixin border-radius($radius) {
  -webkit-border-radius: $radius;
     -moz-border-radius: $radius;
      -ms-border-radius: $radius;
       -o-border-radius: $radius;
          border-radius: $radius;
}

.panel { @include border-radius(5px); }
header { @include border-radius(3px); }
footer { @include border-radius(3px); }
.advertisement { @include border-radius(5px); }

rules.css

article {
  font-family: Arial;
  font-size: 11px; }
  
article h1 {
  font-weight: bold;
  font-size: 150%; }
  
article .important {
  line-height: 1.4em; }
    
article .important a {
  color: red; }

rules.scss

$accentColor: #ff0000;

article {
  font-family: Arial;
  font-size: 11px;
  
  h1{
    font-weight: bold;
    font-size: 150%;
  }
  .important{
    line-height: 1.4em;
    a{
      color: $accentColor;
    }
  }
}

variables.css

body {
  background-color: #cccccc;
  color: #3399cc; }

h1 {
  background-color: #3399cc;
  color: #cccccc; }

variables.scss

$color: #3399CC;
$otherColor: #CCC;

body{
  background-color: $otherColor;
  color: $color;
}

h1{
  background-color: $color;
  color: $otherColor;
}