A responsive CSS grid.



Drag the bookmarklet to your bookmarks bar.

Formstone Grid

Or, include it on every page of your development site:

(function(){if(typeof FSGridBookmarklet==='undefined'){document.body.appendChild(document.createElement('script')).src='';}else{FSGridBookmarklet();}})();


fs-sm-1 fs-md-2 fs-lg-4
fs-sm-2 fs-md-4 fs-lg-8


fs-sm-3 fs-md-3 fs-lg-6
fs-sm-3 fs-md-3 fs-lg-6

3 Column



fs-sm-2 fs-sm-push-1 fs-md-3 fs-md-push-3 fs-lg-8 fs-lg-push-4


-centered fs-all-half


-contained fs-all-half
-contained fs-all-half


-padded fs-all-half
-padded fs-all-half


-right fs-all-half


fs-sm-full fs-md-half fs-lg-half
fs-sm-full fs-md-half fs-lg-half
fs-sm-full fs-md-2 fs-lg-4




The grid works by nesting 'cells' within 'rows'. Cells are defined by classes that set widths at specific breakpoints. The breakpoints correspond to general screen sizes. By default, Grid renders 3 columns on 'small', 6 columns on 'medium' and 12 columns on 'large' displays.


A basic example may look something like:

<body class="fs-grid">
    <div class="fs-row">
        <div class="fs-cell fs-sm-3 fs-md-2 fs-lg-4">...</div>
        <div class="fs-cell fs-sm-3 fs-md-2 fs-lg-4">...</div>
        <div class="fs-cell fs-sm-3 fs-md-2 fs-lg-4">...</div>

This will create 3 cells that each span 3 columns on 'small', 2 columns on 'medium' and 4 columns on 'large' screens. Think of the nested structure like a directory tree:

├─ row
|  ├─ cell
|  |─ cell
|  |  └─ row
|  |     ├─ cell
|  |     └─ cell
|  └─ cell
└─ row
   ├─ cell
   └─ cell


Grid relies on border-box and includes a global box-sizing reset:

*:after {
    box-sizing: border-box;

This will effect every element on the page and can have unexpected results. In the long run it will help speed development by modifying how padding and borders effect the box model calculations. Learn more about border-box.

Row Widths and Columns Counts

Name Screen Size Row Width Column Count
xs smaller than 500px 300px 3
sm smaller than 740px 480px 3
md 740px to 980px 720px 6
lg 980px to 1220px 960px 12
xl larger than 1220px 1200px 12

Defining Cells

Class Description
fs-xs-[x] only extra small size
fs-sm-[x] both small and extra small sizes
fs-md-[x] medium size
fs-lg-[x] both large and extra large sizes
fs-xl-[x] only extra large size
fs-all-[x] all sizes

Cells will default to filling the available horizontal space but can be defined by the target screen size and column count. For example fs-sm-2 will produce a cell spanning 2 of the 3 available columns within the 'small' screen size range. Cell classes can be stacked to specify column spans across all screen sizes:

<div class="fs-cell fs-sm-3 fs-md-6 fs-lg-12">...</div>

The fs-xl-[x] and fs-xs-[x] classes adds level of control when targeting large and small screens. For example, a cell may need to span 2 columns at the small size, but span the full width at the extra small size:

<div class="fs-cell fs-xs-3 fs-sm-2 ...">...</div>

The fs-all-[x] classes will create a cell that spans the specified width on all screen sizes (only works with fraction cell counts):

<div class="fs-cell fs-all-third">...</div>

Fraction Cells

The fraction classes can be used in place of specific column counts:

Class Description
fs-[x]-full entire row width
fs-[x]-half 1/2 row width
fs-[x]-third 1/3 row width
fs-[x]-fourth 1/4 row width
fs-[x]-fifth 1/5 row width

Hidden Cells

To hide cells at specific screen sizes:

Class Description
fs-xs-hide Hide on extra small
fs-sm-hide Hide on small
fs-md-hide Hide on medium
fs-lg-hide Hide on large
fs-xl-hide Hide on extra large

Helper Classes

Helper classes can be added to cells to modify their default behavior in predictable ways.

Class Description
fs-padded Swaps cell margin for padding. Allows backgrounds to touch while maintaining gutters.
fs-contained Removes cell margin. Allows backgrounds to touch by removing gutters.
fs-centered Centers cell. Useful for centering odd column count cells.
fs-right Right aligns cell. Useful for changing document flow on different device sizes.

LESS Configuration

Grid can also be configured and rebuilt using Grunt. Simply edit the variables found in /src/grid/grid-config.less before running the default grunt process.

Variable Default Description
@fs-grid-class-container fs-grid Container class
@fs-grid-class-row fs-row Row class
@fs-grid-class-contained fs-contained Contained helper class
@fs-grid-class-padded fs-padded Padded helper class
@fs-grid-class-centered fs-centered Centered helper class
@fs-grid-class-all fs-all All cell class
@fs-grid-class-xs fs-xs Extra Small cell class
@fs-grid-class-sm fs-sm Small cell class
@fs-grid-class-md fs-md Medium cell class
@fs-grid-class-lg fs-lg Large cell class
@fs-grid-class-xl fs-xl Extra Large cell class
@fs-grid-columns-sm 3 Small column count
@fs-grid-columns-md 6 Medium column count
@fs-grid-columns-lg 12 Large column count
@fs-grid-gutter 1.0416666666666667%; Gutter width
@fs-grid-width-xs 300px Extra Small row width
@fs-grid-width-sm 480px Small row width
@fs-grid-width-md 720px Medium row width
@fs-grid-width-lg 960px Large row width
@fs-grid-width-xl 1200px Extra Large row width
@fs-grid-width-break-xs 320px Extra Small break width
@fs-grid-width-break-sm 500px Small break width
@fs-grid-width-break-md 740px Medium break width
@fs-grid-width-break-lg 980px Large break width
@fs-grid-width-break-xl 1220px Extra Large break width
Media Queries - Max
@fs-grid-mq-max-sm 499px Small max mq
@fs-grid-mq-max-md 739px Medium max mq
@fs-grid-mq-max-lg 979px Large max mq
@fs-grid-mq-max-xl 1219px Extra Large max mq
Media Queries - Min
@fs-grid-mq-min-sm 500px Small min mq
@fs-grid-mq-min-md 740px Medium min mq
@fs-grid-mq-min-lg 980px Large min mq
@fs-grid-mq-min-xl 1220px Extra Large min mq
Mixin-Only Grid
@fs-grid-mixin-only false Disables generation of classes based grid

LESS Extends & Mixins

Grid can be compiled into CSS directly. This allows for a similar declarative approach, without adding classes to markup.

Name Description
.fs_grid_row Base row
.fs_grid_row_fluid Base fluid row
.fs_grid_row_fluid_sm Base fluid row (small only)
.fs_grid_row_row Base nested row
.fs_grid_row_row_contained Base nested row (parent cell is contained)
.fs_grid_cell Base cell
.fs_grid_cell_centered Base centered cell
.fs_grid_cell_padded Base padded cell
.fs_grid_cell_contained Base contained cell
.fs_grid_cell_right Base right cell
.fs_row(); Base row
.fs_row_fluid(); Base row fluid
.fs_row_fluid_sm(); Base fluid row (small only)
.fs_row_row(); Base nested row
.fs_row_row_contained(); Base nested row (parent cell is contained)
.fs_cell(); Base cell
.fs_cell_centered(); Base centered cell
.fs_cell_padded(); Base padded cell
.fs_cell_contained(); Base contained cell
.fs_cell_right(); Base right cell
.fs_cell_xs(@count [, @total]); Extra Small cell; Pass @total to define fractions
.fs_cell_sm(@count [, @total]); Small cell; Pass @total to define fractions
.fs_cell_md(@count [, @total]); Medium cell; Pass @total to define fractions
.fs_cell_lg(@count [, @total]); Large cell; Pass @total to define fractions
.fs_cell_xl(@count [, @total]); Extra Large cell; Pass @total to define fractions
.fs_push_xs(@count [, @total]); Extra Small push; Pass @total to define fractions
.fs_push_sm(@count [, @total]); Small push; Pass @total to define fractions
.fs_push_md(@count [, @total]); Medium push; Pass @total to define fractions
.fs_push_lg(@count [, @total]); Large push; Pass @total to define fractions
.fs_push_xl(@count [, @total]); Extra Large push; Pass @total to define fractions