HTML和CSS实现京东首页（html和css详解）（四）

/*! normalize.css v5.0.0 | MIT License | github.com/necolas/normalize.css */
/*
http://necolas.github.io/normalize.css/
*/
/**
 * 1. Change the default font family in all browsers (opinionated).
 * 2. Correct the line height in all browsers.
 * 3. Prevent adjustments of font size after orientation changes in
 *    IE on Windows Phone and in iOS.
 */
/* Document
   ========================================================================== */
html {
    font-family: sans-serif; /* 1 */
    line-height: 1.15; /* 2 */
    -ms-text-size-adjust: 100%; /* 3 */
    -webkit-text-size-adjust: 100%; /* 3 */
}
/* Sections
   ========================================================================== */
/**
 * Remove the margin in all browsers (opinionated).
 */
body {
    margin: 0;
}
/**
 * Add the correct display in IE 9-.
 */
article,
aside,
footer,
header,
nav,
section {
    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
   ========================================================================== */
/**
 * Add the correct display in IE 9-.
 * 1. Add the correct display in IE.
 */
figcaption,
figure,
main { /* 1 */
    display: block;
}
/**
 * Add the correct margin in IE 8.
 */
figure {
    margin: 1em 40px;
}
/**
 * 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
   ========================================================================== */
/**
 * 1. Remove the gray background on active links in IE 10.
 * 2. Remove gaps in links underline in iOS 8+ and Safari 8+.
 */
a {
    background-color: transparent; /* 1 */
    -webkit-text-decoration-skip: objects; /* 2 */
}
/**
 * Remove the outline on focused links when they are also active or hovered
 * in all browsers (opinionated).
 */
a:active,
a:hover {
    outline-width: 0;
}
/**
 * 1. Remove the bottom border in Firefox 39-.
 * 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 */
}
/**
 * Prevent the duplicate application of `bolder` by the next rule in Safari 6.
 */
b,
strong {
    font-weight: inherit;
}
/**
 * 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 style in Android 4.3-.
 */
dfn {
    font-style: italic;
}
/**
 * Add the correct background and color in IE 9-.
 */
mark {
    background-color: #ff0;
    color: #000;
}
/**
 * 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
   ========================================================================== */
/**
 * Add the correct display in IE 9-.
 */
audio,
video {
    display: inline-block;
}
/**
 * Add the correct display in iOS 4-7.
 */
audio:not([controls]) {
    display: none;
    height: 0;
}
/**
 * Remove the border on images inside links in IE 10-.
 */
img {
    border-style: none;
}
/**
 * Hide the overflow in IE.
 */
svg:not(:root) {
    overflow: hidden;
}
/* Forms
   ========================================================================== */
/**
 * 1. Change the font styles in all browsers (opinionated).
 * 2. Remove the margin in Firefox and Safari.
 */
button,
input,
optgroup,
select,
textarea {
    font-family: sans-serif; /* 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;
}
/**
 * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
 *    controls in Android 4.
 * 2. Correct the inability to style clickable types in iOS and Safari.
 */
button,
html [type="button"], /* 1 */
[type="reset"],
[type="submit"] {
    -webkit-appearance: button; /* 2 */
}
/**
 * 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;
}
/**
 * Change the border, margin, and padding in all browsers (opinionated).
 */
fieldset {
    border: 1px solid #c0c0c0;
    margin: 0 2px;
    padding: 0.35em 0.625em 0.75em;
}
/**
 * 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 */
}
/**
 * 1. Add the correct display in IE 9-.
 * 2. Add the correct vertical alignment in Chrome, Firefox, and Opera.
 */
progress {
    display: inline-block; /* 1 */
    vertical-align: baseline; /* 2 */
}
/**
 * Remove the default vertical scrollbar in IE.
 */
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 and cancel buttons in Chrome and Safari on macOS.
 */
[type="search"]::-webkit-search-cancel-button,
[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 IE 9-.
 * 1. Add the correct display in Edge, IE, and Firefox.
 */
details, /* 1 */
menu {
    display: block;
}
/*
 * Add the correct display in all browsers.
 */
summary {
    display: list-item;
}
/* Scripting
   ========================================================================== */
/**
 * Add the correct display in IE 9-.
 */
canvas {
    display: inline-block;
}
/**
 * Add the correct display in IE.
 */
template {
    display: none;
}
/* Hidden
   ========================================================================== */
/**
 * Add the correct display in IE 10-.
 */
[hidden] {
    display: none;
}