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diff --git a/demo/src/sass/lib/decimal.scss b/demo/src/sass/lib/decimal.scss
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+++ b/demo/src/sass/lib/decimal.scss
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+// _decimal.scss | MIT License | gist.github.com/terkel/4373420
+
+// Round a number to specified digits.
+//
+// @param  {Number} $number A number to round
+// @param  {Number} [$digits:0] Digits to output
+// @param  {String} [$mode:round] (round|ceil|floor) How to round a number
+// @return {Number} A rounded number
+// @example
+//     decimal-round(0.333)    => 0
+//     decimal-round(0.333, 1) => 0.3
+//     decimal-round(0.333, 2) => 0.33
+//     decimal-round(0.666)    => 1
+//     decimal-round(0.666, 1) => 0.7
+//     decimal-round(0.666, 2) => 0.67
+//
+@function decimal-round ($number, $digits: 0, $mode: round) {
+    $n: 1;
+    // $number must be a number
+    @if type-of($number) != number {
+        @warn '#{ $number } is not a number.';
+        @return $number;
+    }
+    // $digits must be a unitless number
+    @if type-of($digits) != number {
+        @warn '#{ $digits } is not a number.';
+        @return $number;
+    } @else if not unitless($digits) {
+        @warn '#{ $digits } has a unit.';
+        @return $number;
+    }
+    @for $i from 1 through $digits {
+        $n: $n * 10;
+    }
+    @if $mode == round {
+        @return round($number * $n) / $n;
+    } @else if $mode == ceil {
+        @return ceil($number * $n) / $n;
+    } @else if $mode == floor {
+        @return floor($number * $n) / $n;
+    } @else {
+        @warn '#{ $mode } is undefined keyword.';
+        @return $number;
+    }
+}
+
+// Ceil a number to specified digits.
+//
+// @param  {Number} $number A number to round
+// @param  {Number} [$digits:0] Digits to output
+// @return {Number} A ceiled number
+// @example
+//     decimal-ceil(0.333)    => 1
+//     decimal-ceil(0.333, 1) => 0.4
+//     decimal-ceil(0.333, 2) => 0.34
+//     decimal-ceil(0.666)    => 1
+//     decimal-ceil(0.666, 1) => 0.7
+//     decimal-ceil(0.666, 2) => 0.67
+//
+@function decimal-ceil ($number, $digits: 0) {
+    @return decimal-round($number, $digits, ceil);
+}
+
+// Floor a number to specified digits.
+//
+// @param  {Number} $number A number to round
+// @param  {Number} [$digits:0] Digits to output
+// @return {Number} A floored number
+// @example
+//     decimal-floor(0.333)    => 0
+//     decimal-floor(0.333, 1) => 0.3
+//     decimal-floor(0.333, 2) => 0.33
+//     decimal-floor(0.666)    => 0
+//     decimal-floor(0.666, 1) => 0.6
+//     decimal-floor(0.666, 2) => 0.66
+//
+@function decimal-floor ($number, $digits: 0) {
+    @return decimal-round($number, $digits, floor);
+}