edx-platform/lms/static/sass/base/_reset.scss

/* HTML5 Boilerplate  */

article,
aside,
details,
figcaption,
figure,
footer,
header,
nav,
section {
  display: block;
}

audio,
canvas,
video {
  display: inline-block;
  *display: inline;
  *zoom: 1;
}

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

html,
button,
input,
select,
textarea {
  font-family: $font-family-sans-serif;
  color: #222;
}

body {
  margin: 0;
  font-size: 1em;
  line-height: 1.4;
}

a:not(.btn) {
  color: $link-color;
}

a:visited:not(.btn) {
  color: #003655;  // from the Pattern Library http://ux.edx.org/design_elements/colors/
}

a:hover:not(.btn),
a:focus:not(.btn) {
  color: #0079bc;  // from the Pattern Library http://ux.edx.org/design_elements/colors/
}

abbr[title] { border-bottom: 1px dotted; }

b,
strong {
  font-weight: bold;
}

blockquote { margin: 1em 40px; }
dfn { font-style: italic; }

hr {
  display: block;
  height: 1px;
  border: 0;
  border-top: 1px solid #ccc;
  margin: 1em 0;
  padding: 0;
}

ins {
  background: #ff9;
  color: #000;
  text-decoration: none;
}

mark {
  background: #ff0;
  color: #000;
  font-style: italic;
  font-weight: bold;
}

pre,
code,
kbd,
samp {
  font-family: monospace, serif;
  _font-family: 'courier new', monospace;
  font-size: 1em;
}

pre {
  white-space: pre;
  white-space: pre-wrap;
  word-wrap: break-word;
}

q { quotes: none; }

q::before,
q::after {
  content: "";
  content: none;
}

small { font-size: 85%; }

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

sup { top: -0.5em; }
sub { bottom: -0.25em; }

ul,
ol {
  @include padding(0, 0, 0, 40px);

  margin: 1em 0;
}

dd { margin: 0 0 0 40px; }

nav ul,
nav ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

img {
  border: 0;
  -ms-interpolation-mode: bicubic;
  vertical-align: middle;
}

svg:not(:root) { overflow: hidden; }
figure { margin: 0; }

form { margin: 0; }

fieldset {
  border: 0;
  margin: 0;
  padding: 0;
}

label { cursor: pointer; }

legend {
  border: 0;
  *margin-left: -7px;
  padding: 0;
  white-space: normal;
}

button,
input,
select,
textarea {
  font-size: 100%;
  margin: 0;
  vertical-align: baseline;
  *vertical-align: middle;
}

button,
input {
  line-height: normal;
}

button,
input[type="button"],
input[type="reset"],
input[type="submit"] {
  cursor: pointer;
  -webkit-appearance: button;
  *overflow: visible;
}

button[disabled],
input[disabled] {
  cursor: default;
}

input[type="checkbox"],
input[type="radio"] {
  box-sizing: border-box;
  padding: 0;
  *width: 13px;
  *height: 13px;
}

input[type="search"] {
  -webkit-appearance: textfield;
  -moz-box-sizing: content-box;
  -webkit-box-sizing: content-box;
  box-sizing: content-box;
}

input[type="search"]::-webkit-search-decoration,
input[type="search"]::-webkit-search-cancel-button {
  -webkit-appearance: none;
}

button::-moz-focus-inner,
input::-moz-focus-inner {
  border: 0;
  padding: 0;
}

button:-moz-focusring { outline: 1px dotted black; }

textarea {
  overflow: auto;
  vertical-align: top;
  resize: vertical;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

td { vertical-align: top; }

.chromeframe {
  margin: 0.2em 0;
  background: #ccc;
  color: black;
  padding: 0.2em 0;
}

.ir {
  display: block;
  border: 0;
  text-indent: -999em;
  overflow: hidden;
  background-color: transparent;
  background-repeat: no-repeat;
  text-align: left;
  direction: ltr;
  *line-height: 0;
}

.ir br { display: none; }

.hidden {
  display: none !important;
  visibility: hidden;
}

.visuallyhidden {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}

.visuallyhidden.focusable:active,
.visuallyhidden.focusable:focus {
  clip: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  position: static;
  width: auto;
}

.invisible { visibility: hidden; }

.clearfix::before,
.clearfix::after {
  content: "";
  display: table;
}

.clearfix::after { clear: both; }
.clearfix { *zoom: 1; }

@media print {
  * {
    background: transparent;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
    filter: none !important;
    -ms-filter: none !important;
  }

  html,
  body {
    background: transparent !important;
  }

  a,
  a:visited {
    text-decoration: underline;
  }

  abbr[title]::after { content: " (" attr(title) ")"; }
  .ir a::after { content: ""; }

  pre,
  blockquote {
    border: 1px solid #999;
    page-break-inside: avoid;
  }

  thead { display: table-header-group; }

  tr,
  img {
    page-break-inside: avoid;
  }

  img { max-width: 100% !important; }

  @page { margin: 1cm 1.2cm 2cm; }

  p,
  h2,
  h3 {
    orphans: 3;
    widows: 3;
  }

  h2,
  h3 {
    page-break-after: avoid;
  }
}