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One mixin to rule them all

Zass is a Sass (CSS) fluid grid framework. Zass is 100% fluid, semantic, clean and allow infinite nesting of columns with the use of a single mixin.

  • 100% fluid because it only uses percentage units to create grid dimensions.
  • Semantic, because thanks to Sass CSS pre-processor there is no need to pollute HTML with design named classes (as .col_4 to indicate 4 grid units width).
  • Clean because it does not use any CSS hack neither uggly negative margins. Zass does not care about obsolete browsers like Internet Explorer 6.
  • Zass can nest infinite levels of columns.
  • And, what is more awesome, Zass can do all of this using one single mixin.


Zass framework requires you are working with Sass.

With git, to get latest stable version:

git clone

Otherwise, download it from:

Move zass files to your sass directory and import sass/_zass.scss from your sass stylesheet:

@import 'sass/zass';

How does it work?

First of all, you have to configure your grid through three variables. Here it is an example for a 960px grid:

$zass-column-width: 60px; //Grid columns width
$zass-gutter-width: 20px; //Grid gutters width
$zass-grid-units: 12; //Grid number of columns

Then, you are ready to start creating and nesting as many columns as you want using the zass-column() mixin:

zass-column($n, $parent-n, $position, $push, $pull);

Here it is an explanation of zass-column parameters:

  • $n: amount of grid units that the column will take up.
  • $parent-n: Only for nested columns, amount of grid units that the parent column takes up. 0 means it is not a nested column. 0 is the default.
  • $position: Only for nested columns, it can be left, right or inner if a column is the left extreme one, the right extreme one or an inner one. inner by default.
  • $push: Amount of grid units to push (left margin) the column
  • $pull: Amount of grid units to pull (right margin) the column

So, let say you have following DOM structure:

<div id="col1">
  <p>Column 1</p>

<div id="col2">
  <div id="col2-1">
    <p>Column 2-1</p>
  <div id="col2-2">
   <p>Column 2-2</p>

 <div id="col3">
   <p>Column 3</p>

With Zass, you could build quickly a grid layout:

@import '../../zass';

$zass-column-width: 60px;
$zass-gutter-width: 20px;
$zass-grid-units: 12;

#col1 {
   @include zass-column(3); //Take up three grid units

#col2 {
   @include zass-column(7); //Take up seven grid units
   #col2-1 {
      @include zass-column(4, 7, 'left'); //Take up 4 grid units inside #col2. It's the left one.
   #col2-2 {
      @include zass-column(3, 7, 'right'); //Take up 3 grid units inside #col2. It's the right one.

#col3 {
   @include zass-column(1, $push: 1); //Take up one grid unit and push one more.

Optionally, you can use a second mixin, zass-grid(), if you want to set grid width as the maximum width for a given container. That way, a perfect pixel photo of a design is achieved for resolutions greater or equal than grid pixel width while it is still 100% fluid for lower resolutions:

zass-grid($em, $rfs)
  • $em: If true, set that maximum width in em. In that case, the grid will increase its width if user increases text zoom level. Defaults to true.
  • $rfs: Relevant font size to calculate maximum width in em units. Default to 16px.

In our example:

#wrapper {
  @include zass-grid(true, 16px); //It ouputs "max-width: 60em;" 


#wrapper {
  @include zass-grid(false); //Will ouput "max-width: 960px;"

More examples

Look at the examples/ directory for more examples.


Variables, functions and mixins are fully documented in the source code.

Contact & Copyright

Copyright 2012, Marc Busqué Pérez, under GNU LESSER GENERAL PUBLIC LICENSE -


Sass grid framework 100% fluid, semantic, clean and allowing infinte nesting level with the use of one single mixin.




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