next-app-boilerplate/styles/vendors/_normalize.scss

// 1. Correct the line height in all browsers.
// 2. Prevent adjustments of font size after orientation changes in iOS.

html {
  line-height: 1.15; // 1
  -webkit-text-size-adjust: 100%; // 2
}

// Sections
// ==========================================================================

// Remove the margin in all browsers.

body {
  margin: 0;
}

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

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

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

// 1. Add the correct box sizing in Firefox.
// 2. Show the overflow in Edge and IE.

hr {
  box-sizing: content-box; // 1
  height: 0; // 1
  overflow: visible; // 2
}

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

pre {
  font-family: monospace, sans-serif; // 1
  font-size: 1em; // 2
}

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

// Remove the gray background on active links in IE 10.

a {
  background-color: transparent;
}

// 1. Remove the bottom border in Chrome 57-
// 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.

abbr[title] {
  border-bottom: 0; // 1
  text-decoration: underline dotted; // 2
}

// 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, sans-serif; // 1
  font-size: 1em; // 2
}

// Add the correct font size in all browsers.

small {
  font-size: 80%;
}

// Prevent `sub` and `sup` elements from affecting the line height in
// all browsers.

sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

sub {
  bottom: -0.25em;
}

sup {
  top: -0.5em;
}

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

// Remove the border on images inside links in IE 10.

img {
  border-style: none;
}

// Forms
// ==========================================================================

// 1. Change the font styles in all browsers.
// 2. Remove the margin in Firefox and Safari.

button,
input,
optgroup,
select,
textarea {
  font-family: inherit; // 1
  font-size: 100%; // 1
  line-height: 1.15; // 1
  margin: 0; // 2
}

// Show the overflow in IE.
// 1. Show the overflow in Edge.

button,
input {
  // 1
  overflow: visible;
}

// Remove the inheritance of text transform in Edge, Firefox, and IE.
// 1. Remove the inheritance of text transform in Firefox.

button,
select {
  // 1
  text-transform: none;
}

// Correct the inability to style clickable types in iOS and Safari.

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

// Remove the inner border and padding in Firefox.

button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
  border-style: none;
  padding: 0;
}

// Restore the focus styles unset by the previous rule.

button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
  outline: 1px dotted ButtonText;
}

// Correct the padding in Firefox.

fieldset {
  padding: 0.35em 0.75em 0.625em;
}

// 1. Correct the text wrapping in Edge and IE.
// 2. Correct the color inheritance from `fieldset` elements in IE.
// 3. Remove the padding so developers are not caught out when they zero out
//    `fieldset` elements in all browsers.

legend {
  box-sizing: border-box; // 1
  color: inherit; // 2
  display: table; // 1
  max-width: 100%; // 1
  padding: 0; // 3
  white-space: normal; // 1
}

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

progress {
  vertical-align: baseline;
}

// Remove the default vertical scrollbar in IE 10+.

textarea {
  overflow: auto;
}

// 1. Add the correct box sizing in IE 10.
// 2. Remove the padding in IE 10.

[type="checkbox"],
[type="radio"] {
  box-sizing: border-box; // 1
  padding: 0; // 2
}

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

[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
  height: auto;
}

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

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

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

[type="search"]::-webkit-search-decoration {
  -webkit-appearance: none;
}

// 1. Correct the inability to style clickable types in iOS and Safari.
// 2. Change font properties to `inherit` in Safari.

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

// Interactive
// ==========================================================================

// Add the correct display in Edge, IE 10+, and Firefox.

details {
  display: block;
}

// Add the correct display in all browsers.

summary {
  display: list-item;
}

// Misc
// ==========================================================================

// Add the correct display in IE 10+.

template {
  display: none;
}

// Add the correct display in IE 10.

[hidden] {
  display: none;
}

// Disable outline when intent is clearly mouse and touch
[data-whatintent="mouse"],
[data-whatintent="touch"],
[data-whatinput="mouse"],
[data-whatinput="touch"] {
  *,
  *:focus {
    outline: none;
  }
}

// Disable iOS callouts when draggable is false
[draggable="false"] {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
}