scratchx/sass/base/_icons.scss

$font-icon: "ScratchX";
@font-face {
    font-family: '#{$font-icon}';
    src:url('../fonts/ScratchX.eot?-omdesu');
    src:url('../fonts/ScratchX.eot?#iefix-omdesu') format('embedded-opentype'),
        url('../fonts/ScratchX.woff?-omdesu') format('woff'),
        url('../fonts/ScratchX.ttf?-omdesu') format('truetype'),
        url('../fonts/ScratchX.svg?-omdesu#ScratchX') format('svg');
    font-weight: normal;
    font-style: normal;
}


$icon-documentation: "\e600";
$icon-download: "\e601";
$icon-github: "\e602";
$icon-link: "\e603";
$icon-right-arrow: "\e604";
$icon-twitter: "\e605";
$icon-upload: "\e606";

$icons: (
    "documentation": "#{$icon-documentation}",
    "download":      "#{$icon-download}",
    "github":        "#{$icon-github}",
    "link":          "#{$icon-link}",
    "right-arrow":   "#{$icon-right-arrow}",
    "twitter":       "#{$icon-twitter}",
    "upload":        "#{$icon-upload}",
);

@mixin icon($position: before, $icon: false, $style: plain, $centered: false, $font-size: 1em) {
    @if $position == both {
        $position: 'before, &:after';
    }
    // Either a :before or :after pseudo-element, or both, defaulting to :before
    &:#{$position} {
        @if $icon {
            // A particular icon has been specified
            content: "#{map-get($icons, $icon)}";
        }

        font-family: $font-icon;
        speak: none;
        font-style: normal;
        font-weight: normal;
        font-variant: normal;
        font-size: $font-size;
        text-transform: none;
        line-height: 1;

        /* Better Font Rendering =========== */
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;

        @if $style == circular {
            border-radius: $font-size/4;
            width: $font-size/2;
            height: $font-size/2;
            text-align: center;
        }


        @if $centered {
            line-height: 1.5;
            position: absolute;
            left: 50%;
            margin-left: -$font-size/4;
        }

        // Include any extra rules supplied for the pseudo-element
        @content;
    }
}