heartthrob: grid system

Heartthrob includes a responsive, mobile first fluid grid system that appropriately scales up to 12 columns as the device or viewport size increases. It includes predefined classes for easy layout options just like you used in bootstrap, but simplified.

Grid systems are used for creating page layouts through a series of rows and columns that house your content. Here's how the heartthrob grid system works:

  • Use rows to create horizontal groups of columns.
  • Content should be placed within columns, and only columns may be immediate children of rows.
  • Predefined grid classes like .row and .col-xs-4 are available for quickly making grid layouts.
  • Columns create gutters (gaps between column content) via padding. That padding is offset in rows for the first and last column via negative margin on .row.
  • The negative margin is why the examples below are outdented. It's so that content within grid columns is lined up with non-grid content.
  • Grid columns are created by specifying the number of twelve available columns you wish to span. For example, three equal columns would use three .col-xs-4.
  • If more than 12 columns are placed within a single row, each group of extra columns will, as one unit, wrap onto a new line.
  • Grid classes apply to devices with screen widths greater than or equal to the breakpoint sizes, and override grid classes targeted at smaller devices. Therefore, e.g. applying any .col-md-* class to an element will not only affect its styling on medium devices but also on large devices if a .col-lg-* class is not present.

Look to the examples for applying these principles to your code.

grid options

See how aspects of the Bootstrap grid system work across multiple devices with a handy table.

Extra small devices Phones (<768px) Small devices Tablets (≥768px) Medium devices Desktops (≥992px) Large devices Desktops (≥1200px)
Grid behavior Horizontal at all times Collapsed to start, horizontal above breakpoints
Container width None (auto) 750px 970px 1170px
Class prefix .col-xs- .col-sm- .col-md- .col-lg-
# of columns 12
Column width Auto ~62px ~81px ~97px
Gutter width 30px (15px on each side of a column)
Nestable Yes
Offsets Yes
Column ordering Yes

example: stacked-to-horizontal

Using a single set of .col-md-* grid classes, you can create a basic grid system that starts out stacked on mobile devices and tablet devices (the extra small to small range) before becoming horizontal on desktop (medium) devices. Place grid columns in any .row.

.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-8
.col-md-4
.col-md-4
.col-md-4
.col-md-4
.col-md-6
.col-md-6

how to use it

<div class="row">
    <div class="col-md-1">.col-md-1</div>
    <div class="col-md-1">.col-md-1</div>
    <div class="col-md-1">.col-md-1</div>
    <div class="col-md-1">.col-md-1</div>
    <div class="col-md-1">.col-md-1</div>
    <div class="col-md-1">.col-md-1</div>
    <div class="col-md-1">.col-md-1</div>
    <div class="col-md-1">.col-md-1</div>
    <div class="col-md-1">.col-md-1</div>
    <div class="col-md-1">.col-md-1</div>
    <div class="col-md-1">.col-md-1</div>
    <div class="col-md-1">.col-md-1</div>
</div>
<div class="row">
    <div class="col-md-8">.col-md-8</div>
    <div class="col-md-4">.col-md-4</div>
</div>
<div class="row">
    <div class="col-md-4">.col-md-4</div>
    <div class="col-md-4">.col-md-4</div>
    <div class="col-md-4">.col-md-4</div>
</div>
<div class="row">
    <div class="col-md-6">.col-md-6</div>
    <div class="col-md-6">.col-md-6</div>
</div>
	

example: mobile and desktop

Don't want your columns to simply stack in smaller devices? Use the extra small and medium device grid classes by adding .col-xs-* .col-md-* to your columns. See the example below for a better idea of how it all works.

.col-xs-12 .col-md-8
.col-xs-6 .col-md-4
.col-xs-6 .col-md-4
.col-xs-6 .col-md-4
.col-xs-6 .col-md-4
.col-xs-6
.col-xs-6

how to use it

<!-- Stack the columns on mobile by making one full-width and the other half-width -->
<div class="row">
    <div class="col-xs-12 col-md-8">.col-xs-12 .col-md-8</div>
    <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
</div>
                          
<!-- Columns start at 50% wide on mobile and bump up to 33.3% wide on desktop -->
<div class="row">
    <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
    <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
    <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
</div>
                          
<!-- Columns are always 50% wide, on mobile and desktop -->
<div class="row">
    <div class="col-xs-6">.col-xs-6</div>
    <div class="col-xs-6">.col-xs-6</div>
</div>
	

example: mobile, tablet, desktop

Build on the previous example by creating even more dynamic and powerful layouts with tablet .col-sm-* classes.

.col-xs-12 .col-sm-6 .col-md-8
.col-xs-6 .col-md-4
.col-xs-6 .col-sm-4
.col-xs-6 .col-sm-4
.col-xs-6 .col-sm-4

how to use it


<div class="row">
	<div class="col-xs-12 col-sm-6 col-md-8">.col-xs-12 .col-sm-6 .col-md-8</div>
	<div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
</div>
<div class="row">
	<div class="col-xs-6 col-sm-4">.col-xs-6 .col-sm-4</div>
	<div class="col-xs-6 col-sm-4">.col-xs-6 .col-sm-4</div>
	<div class="col-xs-6 col-sm-4">.col-xs-6 .col-sm-4</div>
</div>
						

example: column wrapping

If more than 12 columns are placed within a single row, each group of extra columns will, as one unit, wrap onto a new line.

.col-xs-9
.col-xs-4
Since 9 + 4 = 13 > 12, this 4-column-wide div gets wrapped onto a new line as one contiguous unit.
.col-xs-6
Subsequent columns continue along the new line.

how to use it


<div class="row">
	<div class="col-xs-9">.col-xs-9</div>
	<div class="col-xs-4">
					.col-xs-4<br>
					Since 9 + 4 = 13 > 12, this 4-column-wide div gets wrapped onto a new line as one contiguous unit.
	</div>
	<div class="col-xs-6">.col-xs-6<br>Subsequent columns continue along the new line.</div>
</div>
					

offsetting columns

Move columns to the right using .col-md-offset-* classes. These classes increase the left margin of a column by * columns. For example, .col-md-offset-4 moves .col-md-4 over four columns.

.col-md-4
.col-md-4 .col-md-offset-4
.col-md-3 .col-md-offset-3
.col-md-3 .col-md-offset-3
.col-md-6 .col-md-offset-3

how to use it


<div class="row">
	<div class="col-md-4">.col-md-4</div>
	<div class="col-md-4 col-md-offset-4">.col-md-4 .col-md-offset-4</div>
</div>
<div class="row">
	<div class="col-md-3 col-md-offset-3">.col-md-3 .col-md-offset-3</div>
	<div class="col-md-3 col-md-offset-3">.col-md-3 .col-md-offset-3</div>
</div>
<div class="row">
	<div class="col-md-6 col-md-offset-3">.col-md-6 .col-md-offset-3</div>
</div>
					

You can also override offsets from lower grid tiers with .col-*-offset-0 classes.

how to use it


<div class="row">
	<div class="col-xs-6 col-sm-4">
	</div>
	<div class="col-xs-6 col-sm-4">
	</div>
	<div class="col-xs-6 col-xs-offset-3 col-sm-4 col-sm-offset-0">
	</div>
</div>
					

nesting columns

To nest your content with the default grid, add a new .row and set of .col-sm-* columns within an existing .col-sm-* column. Nested rows should include a set of columns that add up to 12 or fewer (it is not required that you use all 12 available columns).

Level 1: .col-sm-9
Level 2: .col-xs-8 .col-sm-6
Level 2: .col-xs-4 .col-sm-6

how to use it


<div class="row">
	<div class="col-sm-9"> Level 1: .col-sm-9
		<div class="row">
			<div class="col-xs-8 col-sm-6"> 
				Level 2: .col-xs-8 .col-sm-6
			</div>
			<div class="col-xs-4 col-sm-6"> 
				Level 2: .col-xs-4 .col-sm-6
			</div>
		</div>
	</div>
</div>
					

column ordering

Easily change the order of our built-in grid columns with .col-md-push-* and .col-md-pull-* modifier classes.

.col-md-9 .col-md-push-3
.col-md-3 .col-md-pull-9

how to use it


<div class="row">
	<div class="col-md-9 col-md-push-3">.col-md-9 .col-md-push-3</div>
	<div class="col-md-3 col-md-pull-9">.col-md-3 .col-md-pull-9</div>
</div>