Stacks

Styles

Section titled Styles

Stacks provides 4 different button styles:

Secondary
Primary
Danger
Muted

Each style is explained below, detailing how and where to use these styles.

Secondary

Section titled Secondary

All buttons, by default, are secondary buttons. There are three, graduating secondary styles:

Clear (default)
Outlined
Filled

A button’s visual weight should correspond to the importance of the button’s action. The more important the action, the heavier the button’s visual weight.

<button class="s-btn" type="button">…</button>
<button class="s-btn s-btn__outlined" type="button">…</button>
<button class="s-btn s-btn__filled" type="button">…</button>

Type	Class	Default State	Selected State	Disabled State
Clear	`.s-btn`
Outlined	`.s-btn` `.s-btn__outlined`
Filled	`.s-btn` `.s-btn__filled`

Primary

Section titled Primary

A visual style used to highlight the most important actions. To avoid confusing users, don’t use more than one primary button within a section or view.

<button class="s-btn s-btn__primary" type="button">…</button>

Type	Class	Default State	Selected State	Disabled State
Primary	`.s-btn` `.s-btn__primary`

Danger

Section titled Danger

Danger buttons are a secondary button style, used to visually communicate destructive actions such as deleting content, accounts, or canceling services.

<button class="s-btn s-btn__danger" type="button">…</button>
<button class="s-btn s-btn__outlined s-btn__danger" type="button">…</button>
<button class="s-btn s-btn__filled s-btn__danger" type="button">…</button>

Type	Class	Default State	Selected State	Disabled State
Clear	`.s-btn` `.s-btn__danger`
Outlined	`.s-btn` `.s-btn__danger` `.s-btn__outlined`
Filled	`.s-btn` `.s-btn__danger` `.s-btn__filled`

Muted

Section titled Muted

Muted buttons are a secondary button style, a grayscale visual treatment. Used in layouts for the least important items or currently inactive actions.

<button class="s-btn s-btn__muted" type="button">…</button>
<button class="s-btn s-btn__outlined s-btn__muted" type="button">…</button>
<button class="s-btn s-btn__filled s-btn__muted" type="button">…</button>

Type	Class	Default State	Selected State	Disabled State
Clear	`.s-btn` `.s-btn__muted`
Outlined	`.s-btn` `.s-btn__muted` `.s-btn__outlined`
Filled	`.s-btn` `.s-btn__muted` `.s-btn__filled`

Loading

Section titled Loading

Any button can have a loading state applied by adding the .is-loading state class.

<button class="s-btn is-loading" type="button">…</button>
<button class="s-btn s-btn__outlined is-loading" type="button">…</button>
<button class="s-btn s-btn__filled is-loading" type="button">…</button>
<button class="s-btn s-btn__primary is-loading" type="button">…</button>

Type	Class	Default State	Selected State	Disabled State
Primary	`.s-btn` `.s-btn__primary` `.is-loading`
Secondary, Clear	`.s-btn` `.is-loading`
Secondary, Outlined	`.s-btn` `.s-btn__outlined` `.is-loading`
Secondary, Filled	`.s-btn` `.s-btn__filled` `.is-loading`
Danger, Clear	`.s-btn` `.s-btn__danger` `.is-loading`
Danger, Outlined	`.s-btn` `.s-btn__danger` `.s-btn__outlined` `.is-loading`
Danger, Filled	`.s-btn` `.s-btn__danger` `.s-btn__filled` `.is-loading`
Muted, Clear	`.s-btn` `.s-btn__muted` `.is-loading`
Muted, Outlined	`.s-btn` `.s-btn__muted` `.s-btn__outlined` `.is-loading`
Muted, Filled	`.s-btn` `.s-btn__muted` `.s-btn__filled` `.is-loading`

Dropdowns

Section titled Dropdowns

Adding the class .s-btn__dropdown to any button style will add an appropriately-styled caret. These should be paired with a menu or popover.

<button class="s-btn s-btn__dropdown" type="button">Dropdown</button>

Type	Class	Default State	Selected State	Disabled State
Primary	`.s-btn` `.s-btn__primary` `.s-btn__dropdown`
Secondary, Clear	`.s-btn` `.s-btn__dropdown`
Secondary, Outlined	`.s-btn` `.s-btn__outlined` `.s-btn__dropdown`
Secondary, Filled	`.s-btn` `.s-btn__filled` `.s-btn__dropdown`
Danger, Clear	`.s-btn` `.s-btn__danger` `.s-btn__dropdown`
Danger, Outlined	`.s-btn` `.s-btn__danger` `.s-btn__outlined` `.s-btn__dropdown`
Danger, Filled	`.s-btn` `.s-btn__danger` `.s-btn__filled` `.s-btn__dropdown`
Muted, Clear	`.s-btn` `.s-btn__muted` `.s-btn__dropdown`
Muted, Outlined	`.s-btn` `.s-btn__muted` `.s-btn__outlined` `.s-btn__dropdown`
Muted, Filled	`.s-btn` `.s-btn__muted` `.s-btn__filled` `.s-btn__dropdown`

Badges

Section titled Badges

Adding an .s-btn--badge to any button will add an appropriately-styled badge.

<button class="s-btn" type="button">
    Badge
    <span class="s-btn--badge">
        <span class="s-btn--number">198</span>
    </span>
</button>

Type	Class	Default State	Selected State	Disabled State
Primary	`.s-btn` `.s-btn__primary` `.s-btn--badge`
Secondary, Clear	`.s-btn` `.s-btn--badge`
Secondary, Outlined	`.s-btn` `.s-btn__outlined` `.s-btn--badge`
Secondary, Filled	`.s-btn` `.s-btn__filled` `.s-btn--badge`
Danger, Clear	`.s-btn` `.s-btn__danger` `.s-btn--badge`
Danger, Outlined	`.s-btn` `.s-btn__danger` `.s-btn__outlined` `.s-btn--badge`
Danger, Filled	`.s-btn` `.s-btn__danger` `.s-btn__filled` `.s-btn--badge`
Muted, Clear	`.s-btn` `.s-btn__muted` `.s-btn--badge`
Muted, Outlined	`.s-btn` `.s-btn__muted` `.s-btn__outlined` `.s-btn--badge`
Muted, Filled	`.s-btn` `.s-btn__muted` `.s-btn__filled` `.s-btn--badge`

Sizes

Section titled Sizes

A button’s default font-size is determined by the @body-fs variable. To change the button’s font-size, use the following classes with .s-btn:

Type	Class	Size
Extra Small	`s-btn__xs`	11px
Small	`s-btn__sm`	12px
Default	N/A	13px
Medium	`s-btn__md`	17px

Toggle buttons

Section titled Toggle buttons

Each button class has a selected state which can be visually activated by applying the .is-selected class. When a button can switch between selected and unselected states, it is important to also annotate the button with the aria-pressed attribute for accessibility. A title attribute may also be appropriate to describe what will happen when pressing the button.

<button class="s-btn" type="button" aria-pressed="false" title="…">…</button>
<button class="s-btn is-selected" type="button" aria-pressed="true" title="…">…</button>

<script>
    toggleButton.addEventListener('click', () => {
        let wasSelected = toggleButton.getAttribute('aria-pressed') === 'true';
        let isSelected = !wasSelected;
        toggleButton.classList.toggle('is-selected', isSelected);
        toggleButton.setAttribute('aria-pressed', isSelected.toString());
        …
    });
</script>

Additional classes

Section titled Additional classes

Stacks provides additional classes for cases that are a bit more rare.

Resets

Section titled Resets

Type	Class	Definition	Example
Unset	`.s-btn__unset`	Removes all styling from a button including its focus state.
Link	`.s-btn__link`	Styles a button element as though it were a link.

Icons

Section titled Icons

Type	Class	Definition	Examples
Icon	`.s-btn__icon`	Adds some margin overrides that apply to an icon within a button

Section titled Social

Type	Class	Definition
Facebook	`.s-btn__facebook`	Styles a button consistent with Facebook’s branding
Google	`.s-btn__google`	Styles a button consistent with Google’s branding
GitHub	`.s-btn__github`	Styles a button consistent with GitHub’s branding

Ordering

Section titled Ordering

To maintain product consistency, buttons should maintain the following layout ordering:

Within a row

Section titled Within a row

Most button groups should be ordered from the most important to the least important action, left to right.

<button class="s-btn s-btn__primary" type="button">Post answer</button>
<button class="s-btn s-btn__filled" type="button">Save draft</button>
<button class="s-btn s-btn__outlined" type="button">Preview answer</button>
<button class="s-btn" type="button">Cancel</button>

Within a column

Section titled Within a column

Sometimes the layout dictates that buttons need to be stacked on top of each other. Again, these buttons should be stacked from the most important to the least important, top to bottom.

<div class="grid gs4 fd-column">
    <button class="grid--cell s-btn s-btn__primary" type="button">Post answer</button>
    <button class="grid--cell s-btn s-btn__filled" type="button">Save draft</button>
    <button class="grid--cell s-btn s-btn__outlined" type="button">Preview answer</button>
    <button class="grid--cell s-btn" type="button">Cancel</button>
</div>

Within a header

Section titled Within a header

Sometimes the best place for a series of actions is in the same area as the title. In these cases, the buttons should be pulled to the right. Within this instance, the button order should be reversed with the most important action to the far right and the least important action to the far left.

<div class="grid gs4">
    <div class="grid ai-center sm:fd-column sm:ai-start">
        <h3 class="grid--cell mb0 sm:mb16 mr-auto fs-title fw-normal">Write your response</h3>

        <div class="grid gs4 sm:fd-row-reverse sm:jc-end">
            <button class="grid--cell s-btn" type="button">Cancel</button>
            <button class="grid--cell s-btn s-btn__filled" type="button">Preview answer</button>
            <button class="grid--cell s-btn s-btn__primary" type="button">Post answer</button>
        </div>
    </div>
</div>

Sections

Buttons