css-mastery-16-master/cssmastery-examples/chapter-12/scss/example.scss

/**
* This file is written in the SCSS syntax of Sass-script. It needs to be 
* compiled into CSS by a Sass library. You can find installation instructions 
* for various applications with Sass support at http://sass-lang.com/install.
*/

$primary-color: #333;
$secondary-color: #fff;

$breakpoints: (
    mid: 35em,
    large: 50em
    );

@function ratio($target, $context) {
    @return ($target / $context) * 100%;
}

@mixin font-smoothing($subpixel: false) {
    @if $subpixel {
        -webkit-font-smoothing: subpixel-antialiased;
        -moz-osx-font-smoothing: auto;
    }
    @else {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    
}

body {
    color: $primary-color;
    background-color: $secondary-color;
}

%inverted {
    color: $secondary-color;
    background-color: $primary-color;
    @include font-smoothing;
}

.row-trio > * {
    @media only screen and (min-width: map-get($breakpoints, large)) {
        width: ratio(300, 960);
    }
}
.page-header {
    @extend %inverted;
}

.page-footer {
    @extend %inverted;
    background-color: #14203B;
    a {
        color: darken(#fff, 10%);
    }
}