reset.css

/**
 * Resets
 *
 * Global resets to common HTML elements.
 * Doesn't depend on any third party libraries.
 * Inspired by Normalise.css and bootstrap/_reboot.scss
 * Doesn't reset form and table because it's hard to set styles back in third-party libraries
 */

/* #region html and body */
html {
  box-sizing: border-box;
  /* Prevent adjustments of font size after orientation changes in IE and iOS. */
  text-size-adjust: 100%;
  font-size: var(--font-size);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-background);
}
*,
*::before,
*::after {
  box-sizing: inherit;
}
body {
  margin: 0;
}
/* #endregion */

/* #region Typography */
body,
button,
input,
select,
textarea {
  font-family: var(--font-family);
}
code,
kbd,
samp,
pre,
time {
  font-family: var(--font-family-monospace);
}

h1,
h2,
h3,
h4 {
  margin-top: 2rem;
}
h5 {
  margin-top: 1.5rem;
}
h6 {
  margin-top: 1rem;
}
p,
blockquote,
table,
dl,
ul,
ol,
address,
figure {
  margin: 1rem 0 0 0;
}
hr {
  margin: 2rem 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-small);
  margin-bottom: 0.5rem;
}
h1 {
  font-size: 32px;
}
h2 {
  font-size: 24px;
}
h3 {
  font-size: 18px;
}
h4,
h5,
h6 {
  font-size: var(--font-size);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  /* Remove gaps in links underline in iOS 8+ and Safari 8+. */
  -webkit-text-decoration-skip: objects;
}
a:active,
a:hover {
  text-decoration: underline;
}

b,
strong,
dt {
  font-weight: var(--font-weight-bold);
}

code,
kbd,
samp {
  background-color: var(--color-background-code);
  font-size: var(--font-size-small);
  padding: 0.2em 0.3em;
}
pre {
  background-color: var(--color-background-faded);
  font-size: 12px;
  line-height: var(--line-height-small);
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1rem 0 0 0;
  padding: 1rem;
}
pre[class*='language-'] {
  margin: 1rem 0 0 0 !important;
  padding: 0.75rem 1rem !important;
  font-size: 12px !important;
}
code[class*='language-'] {
  font-size: 12px !important;
}
/* Override the code styles */
pre code {
  background-color: transparent;
  padding: 0;
}
blockquote {
  border-left: 5px solid var(--color-border);
  color: var(--color-text-muted);
  padding: 0.5rem 0 0.5rem 1rem;
}
blockquote > *:first-child {
  margin-top: 0;
}

ul,
ol {
  padding: 0 0 0 1.5em;
  line-height: var(--line-height-small);
}
dt,
dd,
ol ol,
ul ul,
ol ul,
ul ol {
  margin: 0;
}
li {
  margin-top: 0.5rem;
}

table {
  font-size: 14px;
  line-height: var(--line-height-small);
}

hr {
  border: 0;
  border-top: 1px solid var(--color-border);
}

small {
  font-size: var(--font-size-small);
}

/* Prevent `sub` and `sup` elements from affecting the line height in all browsers. */
sub,
sup {
  font-size: var(--font-size-small);
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}
sub {
  bottom: -0.2em;
}
sup {
  top: -0.4em;
}

address,
time {
  font-style: normal;
  color: var(--color-text-muted);
}
mark {
  background-color: yellow;
  color: var(--color-text);
  padding: 0 0.2em;
}
rt {
  font-size: 60%;
}
abbr[title] {
  border-bottom: 0;
  text-decoration: underline;
  text-decoration: underline dotted;
}
/* #endregion */

/* #region Embedded Content */
/* Add the correct display in iOS 4-7. */
audio:not([controls]) {
  display: none;
  height: 0;
}

img {
  max-width: 100%;
  vertical-align: middle;
  /* Remove the border on images inside links in IE 10-. */
  border-style: none;
}

audio,
video {
  max-width: 100%;
}

figcaption {
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
}

table {
  /* Reset for nesting within parents with `background-color`. */
  background-color: var(--color-background);
  border: 0;
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
}
table caption {
  caption-side: bottom;
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
  padding: 5px 1rem;
  text-align: left;
}

table th,
table td {
  border: 0;
  border-bottom: 1px solid var(--color-border);
  padding: 5px 0.5rem;
  text-align: left;
}

table th {
  background-color: var(--color-background-faded);
  font-weight: var(--font-weight-bold);
}
/* #endregion */

/* #region Forms */
/**
* iOS "clickable elements" fix for role="button"
*
* Fixes "clickability" issue (and more generally, the firing of events such as focus as well)
* for traditionally non-focusable elements with role="button"
* see https://developer.mozilla.org/en-US/docs/Web/Events/click#Safari_Mobile
*/
[role='button'] {
  cursor: pointer;
}

/* Avoid 300ms click delay on touch devices that support the `touch-action` CSS property. */
a,
area,
button,
[role='button'],
input,
label,
select,
summary,
textarea {
  touch-action: manipulation;
}

button,
/* Prevent a WebKit bug where (*) destroys native `audio` and `video` controls in Android 4. */
html [type=button],
[type=reset],
[type=submit],
::-webkit-file-upload-button {
  /* (*) Correct the inability to style clickable types in iOS and Safari. */
  appearance: button;
}

[type='search'] {
  /* Correct the odd appearance in Chrome and Safari. */
  appearance: none;
}

/* Change font properties to `inherit` in Safari. */
::-webkit-file-upload-button {
  font: inherit;
}

[hidden] {
  display: none;
}

fieldset {
  border: 1px solid var(--color-border);
  margin: 1rem 0 0;
  padding: 0 1rem 1rem;
}

legend {
  padding: 0 0.2em;
}

optgroup {
  color: var(--color-text-muted);
  font-style: normal;
  font-weight: normal;
}

option {
  color: var(--color-text);
}

progress {
  max-width: 100%;
}
/* #endregion */