backpack.css/dist/index.css

A lightweight and somewhat opinionated CSS foundation that is best suited to applications 🎒.

/*! backpack.css v2.2.0 | MIT License | github.com/chris-pearce/backpack.css */

/**
 * 1. Vendor stylesheets.
 * 2. See the "File structure" section in CONTRIBUTING.md.
 * 3. The stylesheet names come from MDN's HTML elements reference document. See
 *    https://developer.mozilla.org/en-US/docs/Web/HTML/Element.
 *
 * NOTE: The order of the imports must be maintained.
 */

/* Document
 * ========================================================================== */

/**
 * Add border box sizing in all browsers (opinionated).
 */

*,
::before,
::after {
  box-sizing: border-box;
}

/**
 * 1. Add text decoration inheritance in all browsers (opinionated).
 * 2. Add vertical alignment inheritance in all browsers (opinionated).
 */

::before,
::after {
  text-decoration: inherit; /* 1 */
  vertical-align: inherit; /* 2 */
}

/**
 * 1. Use the default cursor in all browsers (opinionated).
 * 2. Change the line height in all browsers (opinionated).
 * 3. Breaks words to prevent overflow in all browsers (opinionated).
 * 4. Use a 4-space tab width in all browsers (opinionated).
 * 5. Remove the grey highlight on links in iOS (opinionated).
 * 6. Prevent adjustments of font size after orientation changes in iOS.
 */

html {
  cursor: default; /* 1 */
  line-height: 1.5; /* 2 */
  overflow-wrap: anywhere; /* 3 */
  -moz-tab-size: 4; /* 4 */
  tab-size: 4; /* 4 */
  -webkit-tap-highlight-color: transparent /* 5 */;
  -webkit-text-size-adjust: 100%; /* 6 */
}

/* Sections
 * ========================================================================== */

/**
 * Remove the margin in all browsers (opinionated).
 */

body {
  margin: 0;
}

/**
 * Correct the font size and margin on `h1` elements within `section` and
 * `article` contexts in Chrome, Edge, Firefox, and Safari.
 */

h1 {
  font-size: 2em;
  margin: 0.67em 0;
}

/* Grouping content
 * ========================================================================== */

/**
 * Remove the margin on nested lists in Chrome, Edge, and Safari.
 */

dl dl,
dl ol,
dl ul,
ol dl,
ul dl {
  margin: 0;
}

/**
 * 1. Correct the inheritance of border color in Firefox.
 * 2. Add the correct box sizing in Firefox.
 */

hr {
  color: inherit; /* 1 */
  height: 0; /* 2 */
}

/**
 * Remove the list style on navigation lists in all browsers (opinionated).
 */

nav ol,
nav ul {
  list-style: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'/%3E");
  padding: 0;
}

/**
 * Prevent VoiceOver from ignoring list semantics in Safari (opinionated).
 */

nav li::before {
  content: "\200B";
}

/**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 * 3. Prevent overflow of the container in all browsers (opinionated).
 */

pre {
  font-family: monospace, monospace; /* 1 */
  font-size: 1em; /* 2 */
  overflow: auto; /* 3 */
}

/* Text-level semantics
 * ========================================================================== */

/**
 * Add the correct text decoration in Safari.
 */

abbr[title] {
  text-decoration: underline;
  -webkit-text-decoration: underline dotted;
          text-decoration: underline dotted;
}

/**
 * Add the correct font weight in Chrome, Edge, and Safari.
 */

b,
strong {
  font-weight: bolder;
}

/**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 */

code,
kbd,
samp {
  font-family: monospace, monospace; /* 1 */
  font-size: 1em; /* 2 */
}

/**
 * Add the correct font size in all browsers.
 */

small {
  font-size: 80%;
}

/* Embedded content
 * ========================================================================== */

/*
 * Change the alignment on media elements in all browsers (opinionated).
 */

audio,
canvas,
iframe,
img,
svg,
video {
  vertical-align: middle;
}

/**
 * Add the correct display in iOS 4-7.
 */

audio:not([controls]) {
  display: none;
  height: 0;
}

/**
 * Remove the border on iframes in all browsers (opinionated).
 */

iframe {
  border-style: none;
}

/**
 * Change the fill color to match the text color in all browsers (opinionated).
 */

svg:not([fill]) {
  fill: currentColor;
}

/* Tabular data
 * ========================================================================== */

/**
 * 1. Collapse border spacing in all browsers (opinionated).
 * 2. Correct table border color inheritance in all Chrome, Edge, and Safari.
 * 3. Remove text indentation from table contents in Chrome, Edge, and Safari.
 */

table {
  border-collapse: collapse; /* 1 */
  border-color: inherit; /* 2 */
  text-indent: 0; /* 3 */
}

/* Forms
 * ========================================================================== */

/**
 * Remove the margin on controls in Safari.
 */

button,
input,
select {
  margin: 0;
}

/**
 * Remove the inheritance of text transform in Firefox.
 */

button {
  text-transform: none;
}

/**
 * Correct the inability to style buttons in iOS and Safari.
 */

button,
[type="button" i],
[type="reset" i],
[type="submit" i] {
  -webkit-appearance: button;
}

/**
 * 1. Change the inconsistent appearance in all browsers (opinionated).
 * 2. Correct the padding in Firefox.
 */

fieldset {
  border: 1px solid #a0a0a0; /* 1 */
  padding: 0.35em 0.75em 0.625em; /* 2 */
}

/**
 * Add the correct vertical alignment in Chrome, Edge, and Firefox.
 */

progress {
  vertical-align: baseline;
}

/**
 * Remove the inheritance of text transform in Firefox.
 */

select {
  text-transform: none;
}

/**
 * 1. Remove the margin in Firefox and Safari.
 * 3. Change the resize direction in all browsers (opinionated).
 */

textarea {
  margin: 0; /* 1 */
  resize: vertical; /* 3 */
}

/**
 * 1. Correct the odd appearance in Chrome, Edge, and Safari.
 * 2. Correct the outline style in Safari.
 */

[type="search" i] {
  -webkit-appearance: textfield; /* 1 */
  outline-offset: -2px; /* 2 */
}

/**
 * Correct the cursor style of increment and decrement buttons in Safari.
 */

::-webkit-inner-spin-button,
::-webkit-outer-spin-button {
  height: auto;
}

/**
 * Correct the text style of placeholders in Chrome, Edge, and Safari.
 */

::-webkit-input-placeholder {
  color: inherit;
  opacity: 0.54;
}

/**
 * Remove the inner padding in Chrome, Edge, and Safari on macOS.
 */

::-webkit-search-decoration {
  -webkit-appearance: none;
}

/**
 * 1. Correct the inability to style upload buttons in iOS and Safari.
 * 2. Change font properties to `inherit` in Safari.
 */

::-webkit-file-upload-button {
  -webkit-appearance: button; /* 1 */
  font: inherit; /* 2 */
}

/**
 * Remove the inner border and padding of focus outlines in Firefox.
 */

::-moz-focus-inner {
  border-style: none;
  padding: 0;
}

/**
 * Restore the focus outline styles unset by the previous rule in Firefox.
 */

:-moz-focusring {
  outline: 1px dotted ButtonText;
}

/**
 * Remove the additional :invalid styles in Firefox.
 */

:-moz-ui-invalid {
  box-shadow: none;
}

/* Interactive
 * ========================================================================== */

/*
 * Add the correct styles in Safari.
 */

dialog {
  background-color: white;
  border: solid;
  color: black;
  height: -moz-fit-content;
  height: -webkit-fit-content;
  height: fit-content;
  left: 0;
  margin: auto;
  padding: 1em;
  position: absolute;
  right: 0;
  width: -moz-fit-content;
  width: -webkit-fit-content;
  width: fit-content;
}

dialog:not([open]) {
  display: none;
}

/*
 * Add the correct display in all browsers.
 */

summary {
  display: list-item;
}

/* Accessibility
 * ========================================================================== */

/**
 * Change the cursor on busy elements in all browsers (opinionated).
 */

[aria-busy="true" i] {
  cursor: progress;
}

/*
 * Change the cursor on control elements in all browsers (opinionated).
 */

[aria-controls] {
  cursor: pointer;
}

/*
 * Change the cursor on disabled, not-editable, or otherwise
 * inoperable elements in all browsers (opinionated).
 */

[aria-disabled="true" i],
[disabled] {
  cursor: not-allowed;
}

/*
 * Change the display on visually hidden accessible elements
 * in all browsers (opinionated).
 */

[aria-hidden="false" i][hidden] {
  display: initial;
}

[aria-hidden="false" i][hidden]:not(:focus) {
  clip: rect(0, 0, 0, 0);
  position: absolute;
}

/* 1 */

/**
 * 1. Change the inconsistent appearance in all browsers (opinionated).
 * 2. Add typography inheritance in all browsers (opinionated).
 */

button,
input,
select,
textarea {
  background-color: transparent; /* 1 */
  border: 1px solid WindowFrame; /* 1 */
  color: inherit; /* 1 */
  font: inherit; /* 2 */
  letter-spacing: inherit; /* 2 */
  padding: 0.25em 0.375em; /* 1 */
}

/**
 * Change the inconsistent appearance in all browsers (opinionated).
 */

select {
  -moz-appearance: none;
  -webkit-appearance: none;
  background: no-repeat right center / 1em;
  border-radius: 0;
  padding-right: 1em;
}

/**
 * Change the inconsistent appearance in all browsers (opinionated).
 */

select:not([multiple]):not([size]) {
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='4'%3E%3Cpath d='M4 0h6L7 4'/%3E%3C/svg%3E");
}

/**
 * Remove the border and padding in all browsers (opinionated).
 */

[type="color" i],
[type="range" i] {
  border-width: 0;
  padding: 0;
}

/* 1 */

/*
* 1. Remove animations when motion is reduced (opinionated).
* 2. Remove fixed background attachments when motion is reduced (opinionated).
* 3. Remove timed scrolling behaviors when motion is reduced (opinionated).
* 4. Remove transitions when motion is reduced (opinionated).
*/

@media (prefers-reduced-motion: reduce) {
  *,
  ::before,
  ::after {
    animation-delay: -1ms !important; /* 1 */
    animation-duration: 1ms !important; /* 1 */
    animation-iteration-count: 1 !important; /* 1 */
    background-attachment: initial !important; /* 2 */
    scroll-behavior: auto !important; /* 3 */
    transition-delay: 0s !important; /* 4 */
    transition-duration: 0s !important; /* 4 */
  }
}

/* 1 */

/**
 * Use the default user interface font in all browsers (opinionated).
 */

html {
  font-family:
    system-ui,
    /* macOS 10.11-10.12 */ -apple-system,
    /* Windows 6+ */ "Segoe UI",
    /* Android 4+ */ "Roboto",
    /* Ubuntu 10.10+ */ "Ubuntu",
    /* Gnome 3+ */ "Cantarell",
    /* KDE Plasma 5+ */ "Noto Sans",
    /* fallback */ sans-serif,
    /* macOS emoji */ "Apple Color Emoji",
    /* Windows emoji */ "Segoe UI Emoji",
    /* Windows emoji */ "Segoe UI Symbol",
    /* Linux emoji */ "Noto Color Emoji";
}

/**
 * Use the default monospace user interface font in all browsers (opinionated).
 */

code,
kbd,
samp,
pre {
  font-family:
    /* macOS 10.10+ */ "Menlo",
    /* Windows 6+ */ "Consolas",
    /* Android 4+ */ "Roboto Mono",
    /* Ubuntu 10.10+ */ "Ubuntu Monospace",
    /* KDE Plasma 5+ */ "Noto Mono",
    /* KDE Plasma 4+ */ "Oxygen Mono",
    /* Linux/OpenOffice fallback */ "Liberation Mono",
    /* fallback */ monospace,
    /* macOS emoji */ "Apple Color Emoji",
    /* Windows emoji */ "Segoe UI Emoji",
    /* Windows emoji */ "Segoe UI Symbol",
    /* Linux emoji */ "Noto Color Emoji";
}

/* 1 */

/**
 * Prevents an unwanted focus outline from appearing around elements that might
 * still respond to pointer events.
 */

/* stylelint-disable-next-line a11y/no-outline-none */

[tabindex='-1']:focus {
  outline: none !important;
}

/**
 * Apply Firefox's default focus ring instead of sanitize.css's version as it is
 * more prominent.
 */

:-moz-focusring {
  outline: 5px auto Highlight;
}

/**
 * Remove the outline in cases where the UA determines via heuristics that the
 * focus should not be visible. This is mainly for ensuring that a focus
 * ring does not render for mouse pointers.
 *
 * @credit https://css-tricks.com/the-focus-visible-trick/
 */

/* stylelint-disable-next-line a11y/no-outline-none */

*:focus:not(:focus-visible) {
  outline: none;
}

/* 2 */

/**
 * 1. Apply OpenType features globally:
 *    - Apply kerning.
 *    - Apply common ligatures.
 *    - Apply standard ligatures
 *    - Apply contextual ligatures.
 *    - Apply proportional numerals.
 *    - Apply old-style numerals.
 *    NOTE: If any of the `font-feature-settings` values are not required on
 *    child elements, e.g.: `<td>`, then you have to turn them off explicitly.
 *    Also, see the "OpenType features" section in the README.md.
 * 2. Set the global font size using the standard user-agent size, which is
 *    typically 16px.
 */

html {
  font-feature-settings: 'kern', 'liga', 'clig', 'calt', 'onum', 'pnum'; /* 1 */
  -webkit-font-kerning: normal;
          font-kerning: normal; /* 1 */
  font-size: 1rem; /* 2 */
  font-variant-ligatures: common-ligatures contextual; /* 1 */
  font-variant-numeric: oldstyle-nums proportional-nums; /* 1 */
}

/* 3 */

/*
 * 1. Remove the top inner shadow that iOS applies to all textual inputs.
 * 2. Remove rounded corners that iOS applies to all input buttons.
 */

input,
textarea {
  background-clip: padding-box; /* 1 */
  border-radius: 0; /* 2 */
}

/*
 * 1. Prevent any horizontal overflow.
 * 2. sanitize.css's evergreen.css stylesheet doesn't apply the logical property
 *    version. Therefore, it's applied here alongside the non-logical property
 *    version.
 */

textarea {
  max-width: 100%; /* 1 */
  resize: vertical; /* 2 */
  resize: block; /* 2 */
}

/*
 * Apply left text alignment to buttons instead of the default center alignment.
 */

[type='submit'],
[type='button'],
[type='reset'],
button {
  text-align: left;
  text-align: start;
}

/*
 * Apply the more familiar pointer cursor to non-disabled buttons.
 */

[type='submit']:not(:disabled),
[type='button']:not(:disabled),
[type='reset']:not(:disabled),
button:not(:disabled) {
  cursor: pointer;
}

/**
 * Apply OpenType features to mostly numeric input types:
 * - Remove kerning.
 * - Remove proportional numerals.
 * - Remove old-style numerals.
 * - Apply lining numerals.
 *
 * NOTE: See the "OpenType features" section in the README.md.
 */

[type='color'],
[type='date'],
[type='datetime-local'],
[type='month'],
[type='number'],
[type='range'],
[type='tel'],
[type='time'],
[type='week'] {
  font-feature-settings: 'kern' 0, 'onum' 0, 'lnum';
  -webkit-font-kerning: none;
          font-kerning: none;
  font-variant-numeric: lining-nums;
}

/**
 * Indicates that a label will shift focus to its associated control.
 */

label[for] {
  cursor: pointer;
}

/**
 * 1. Remove user-agent styles.
 * 2. Fix an issue in Safari where the element prematurely wraps.
 */

legend {
  border: 0; /* 1 */
  padding: 0; /* 1 */
  width: 100%; /* 2 */
}

/**
 * 1. Remove user-agent styles.
 * 2. Override the user-agent's `min-width: min-content;` rule with the more
 *    standard `min-width: 0;` to render as a block element would.
 *    @credit https://thatemil.com/blog/2015/01/03/reset-your-fieldset.
 * 3. Remove the padding applied by both the user-agent and sanitize.css.
 */

fieldset {
  border: 0; /* 1 */
  min-width: 0; /* 2 */
  padding: 0; /* 3 */
}

body:not(:-moz-handler-blocked) fieldset {
  display: table-cell;
}

/* 3 */

/**
 * Scope heading styles to classes instead of an element selector so that styles
 * get divorced from semantics. I.e., if you want a `<h4>` to look like a `<h2>`
 * you can easily do this. Therefore, all heading elements get reset to have the
 * same styles as the body copy. See:
 * https://medium.com/fed-or-dead/handling-headings-in-a-ui-component-library-2587de93c890
 */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-size: inherit;
  font-weight: normal;
  line-height: inherit;
}

/* 3 */

/*
 * Apply a more readable underline for links.
 */

a {
  -webkit-text-decoration-skip: ink;
          text-decoration-skip-ink: auto;
}

/*
 * The majority of the time, italic formatting is not desired.
 */

em {
  font-style: normal;
}

/*
 * Override sanitize.css's 80% font size to be 100% as the majority of the time
 * a smaller font size is not desired.
 */

small {
  font-size: 100%;
}

/**
 * Apply a more suitable treatment to superscript and subscript text if it's
 * supported.
 */

@supports (font-variant-position: sub) and (font-variant-position: super) {
  sub,
  sup {
    vertical-align: inherit;
  }

  sub {
    font-variant-position: sub;
  }

  sup {
    font-variant-position: super;
  }
}

/* 3 */

/*
 * Lists in applications hardly ever require their default markers and
 * indentation. Therefore, it makes sense to remove these user-agent styles
 * rather than doing it within each list-type component. When default styled
 * lists are needed, say, in some long-form copy, then markers and indentation
 * can get reintroduced within a specific component that handles that type of
 * list.
 *
 * 1. Override sanitize.css's `list-style` styles.
 * 2. Remove the pseudo-element sanitize.css applies.
 *
 * NOTE: The overridden sanitize.css styles above are applied as the fix
 * sanitize.css applies to prevent VoiceOver from ignoring list semantics in
 * Safari when list markers get removed (see:
 * https://www.scottohara.me/blog/2019/01/12/lists-and-safari.html) does not
 * make a difference when testing in latest Safari.
 *
 * TODO: Create a GitHub issue letting sanitize.css know about the NOTE: above.
 */

ul,
ol,
nav ol /* 1 */,
nav ul /* 1 */ {
  list-style: none;
  padding: 0;
}

nav li::before {
  display: none; /* 2 */
}

/*
 * 1. Apply a solid, thin horizontal rule.
 * 2. Remove Firefox's `color: gray` style.
 * 3. Remove user-agent's default 1px height, and common `overflow: hidden`.
 *
 * @credit https://github.com/jensimmons/cssremedy/
 */

hr {
  border-style: solid; /* 1 */
  border-width: 1px 0 0; /* 1 */
  color: inherit; /* 2 */
  height: 0; /* 3 */
  overflow: visible; /* 3 */
}

/* 3 */

/*
 * Using a block display, make all embedded elements responsive by default.
 *
 * @credit https://github.com/jensimmons/cssremedy
 */

audio,
canvas,
embed,
iframe,
img,
object,
svg,
video {
  display: block;
  max-width: 100%;
}

/*
 * Maintain intrinsic aspect ratios when `max-width` is applied (`iframe`,
 * `embed`, and `object` have no intrinsic ratio; their height gets applied
 * explicitly).
 *
 * @credit https://github.com/jensimmons/cssremedy
 */

img,
svg,
video,
canvas {
  height: auto;
}

/*
 * Remove the default `300px` width, especially as audio files are unlikely to
 * come with a `width` attribute.
 *
 * @credit https://github.com/jensimmons/cssremedy
*/

audio {
  width: 100%;
}

/* 3 */

/*
 * Remove user-agent styles.
 */

th {
  font-weight: normal;
  text-align: left;
  text-align: start;
}

/**
 * Apply OpenType features to table cells:
 * - Remove proportional numerals.
 * - Remove old-style numerals
 * - Apply lining numerals.
 * - Apply tabular numerals.
 * - Apply slashed zero.
 *
 * NOTE: See the "OpenType features" section in the README.md.
 */

td {
  font-feature-settings: 'onum' 0, 'pnum' 0, 'lnum', 'tnum', 'zero';
  font-variant-numeric: lining-nums tabular-nums slashed-zero;
}

/* 3 */

/**
 * Remove margin from all elements that have it applied by default.
 */

blockquote,
figure,
form,
dl,
dd,
h1,
h2,
h3,
h4,
h5,
h6,
p,
pre,
ul,
ol {
  margin: 0;
}

/**
 * Apply OpenType features to elements that use a monospaced font:
 * - Remove kerning.
 * - Remove common ligatures.
 * - Remove standard ligatures
 * - Apply lining numerals.
 * - Apply tabular numerals.
 * - Apply slashed zero.
 *
 * NOTE: See the "OpenType features" section in the README.md.
 */

code,
kbd,
pre,
samp {
  font-feature-settings: 'kern' 0, 'liga' 0, 'clig' 0, 'onum' 0, 'pnum' 0,
    'tnum', 'lnum', 'zero';
  -webkit-font-kerning: none;
          font-kerning: none;
  font-variant-ligatures: contextual;
  font-variant-numeric: lining-nums tabular-nums slashed-zero;
}

/**
 * Avoid 300ms click delay on touch devices that support the `touch-action` CSS
 * property.
 *
 * @credit
 * - http://caniuse.com/#feat=css-touch-action
 * - http://patrickhlauke.github.io/touch/tests/results/#suppressing-300ms-delay
 * - https://adactio.com/journal/10019
 * - https://developers.google.com/web/updates/2013/12/300ms-tap-delay-gone-away
 */

a,
area,
button,
input,
label,
select,
summary,
textarea,
[tabindex]:not([tabindex='-1']) {
  touch-action: manipulation;
}

/* 2 */