Normalización de CSS

/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */
/* Document
   ========================================================================== */
/**
 * 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;
}
/**
 * Render the main element consistently in IE.
 */
main {
display: block;
}
/**
 * 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, monospace; /* 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: none; /* 1 /
text-decoration: underline; / 2 /
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, monospace; /* 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;
}