/* ------------------------------------------
 * IT书包
 * 网址：www.itshubao.com
 * 整理：yinq<3331653644@qq.com> 
 -------------------------------------------- */
*, *:after, *::before {
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
}
.ac-custom {
	padding: 0 3em;
	max-width: 900px;
	margin: 0 auto;
}
.ac-custom h2 {
	font-size: 3em;
	font-weight: 300;
	padding: 0 0 0.5em;
	margin: 0 0 30px;
}
.ac-custom ul, .ac-custom ol {
	list-style: none;
	padding: 0;
	margin: 0 auto;
	max-width: 800px;
}
.ac-custom li {
	margin: 0 auto;
	padding: 2em 0;
	position: relative;
}
.ac-custom label {
	display: inline-block;
	position: relative;
	font-size: 2em;
	padding: 0 0 0 80px;
	vertical-align: top;
	color: rgba(0,0,0,0.2);
	cursor: pointer;
	-webkit-transition: color 0.3s;
	transition: color 0.3s;
}
.ac-custom input[type="checkbox"], .ac-custom input[type="radio"], .ac-custom label::before {
	width: 50px;
	height: 50px;
	top: 50%;
	left: 0;
	margin-top: -25px;
	position: absolute;
	cursor: pointer;
}
.ac-custom input[type="checkbox"], .ac-custom input[type="radio"] {
	opacity: 0;
	-webkit-appearance: none;
	display: inline-block;
	vertical-align: middle;
	z-index: 100;
}
.ac-custom label::before {
	content: '';
	border: 4px solid #fff;
	-webkit-transition: opacity 0.3s;
	transition: opacity 0.3s;
}
.ac-radio label::before {
	border-radius: 50%;
}
.ac-custom input[type="checkbox"]:checked + label, .ac-custom input[type="radio"]:checked + label {
	color: #fff;
}
.ac-custom input[type="checkbox"]:checked + label::before, .ac-custom input[type="radio"]:checked + label::before {
	opacity: 0.8;
}
/* General SVG and path styles */

.ac-custom svg {
	position: absolute;
	width: 40px;
	height: 40px;
	top: 50%;
	margin-top: -20px;
	left: 5px;
	pointer-events: none;
}
.ac-custom svg path {
	stroke: #fdfcd3;
	stroke-width: 13px;
	stroke-linecap: round;
	stroke-linejoin: round;
	fill: none;
}
/* Specific input, SVG and path styles */

/* Circle */
.ac-circle input[type="checkbox"], .ac-circle input[type="radio"], .ac-circle label::before {
	width: 30px;
	height: 30px;
	margin-top: -15px;
	left: 10px;
	position: absolute;
}
.ac-circle label::before {
	background-color: #fff;
	border: none;
}
.ac-circle svg {
	width: 70px;
	height: 70px;
	margin-top: -35px;
	left: -10px;
}
.ac-circle svg path {
	stroke-width: 5px;
}
/* Box Fill */
.ac-boxfill svg path {
	stroke-width: 8px;
}
/* Swirl */
.ac-swirl svg path {
	stroke-width: 8px;
}
/* List */
.ac-list ol {
	list-style: decimal;
	list-style-position: inside;
}
.ac-list ol li {
	font-size: 2em;
	padding: 1em 1em 0 2em;
	text-indent: -40px;
}
.ac-list ol li label {
	font-size: 1em;
	text-indent: 0;
	padding-left: 30px;
}
.ac-list label::before {
	display: none;
}
.ac-list svg {
	width: 100%;
	height: 80px;
	left: 0;
	top: 1.2em;
	margin-top: 0px;
}
.ac-list svg path {
	stroke-width: 4px;
}

/* Media Queries */
@media screen and (max-width: 50em) {
section {
	font-size: 80%;
}
}
body {
	background: silver;
	color: #fff;
	font-family: Arial, sans-serif;
}
a {
	color: #fff;
	opacity: 0.7;
	text-decoration: none;
}
a:hover, a:focus {
	opacity: 1;
}
.container > header {
	margin: 0 auto;
	padding: 4em 2em;
	text-align: center;
	background: rgba(0,0,0,.05);
}
.container > header h1 {
	font-size: 2.625em;
	line-height: 1.3;
	margin: 0;
	font-weight: 300;
}
.container > header span {
	display: block;
	font-size: 60%;
	color: rgba(0,0,0,.2);
	font-weight: 400;
	padding: 0 0 0.6em 0.1em;
}
section {
	padding: 7em 0;
}
section:nth-child(even) {
	background: rgba(0,0,0,.05);
}
section.related {
	text-align: center;
	font-size: 1.6em;
}
.related p {
	margin: 0;
	padding: 1.1em;
}
/* To Navigation Style */
.codrops-top {
	text-transform: uppercase;
	width: 100%;
	font-size: 0.69em;
	line-height: 2.2;
	font-weight: 700;
}
.codrops-top a {
	text-decoration: none;
	padding: 0 1em;
	letter-spacing: 0.1em;
	display: inline-block;
}
.codrops-top span.right {
	float: right;
}
.codrops-top span.right a {
	float: left;
	display: block;
}
.codrops-icon:before {
	font-family: 'codropsicons';
	margin: 0 4px;
	speak: none;
	font-style: normal;
	font-weight: normal;
	font-variant: normal;
	text-transform: none;
	line-height: 1;
	-webkit-font-smoothing: antialiased;
}
.codrops-icon-drop:before {
	content: "\e001";
}
.codrops-icon-prev:before {
	content: "\e004";
}

@media screen and (max-width: 25em) {
.codrops-icon span {
	display: none;
}
}
article, aside, details, figcaption, figure, footer, header, hgroup, main, nav, section, summary {
	display: block;
}
audio, canvas, video {
	display: inline-block;
}
audio:not([controls]) {
	display: none;
	height: 0;
}
[hidden] {
	display: none;
}
html {
	font-family: sans-serif;
	-ms-text-size-adjust: 100%;
	-webkit-text-size-adjust: 100%;
}
body {
	margin: 0;
}
a:focus {
	outline: thin dotted;
}
a:active, a:hover {
	outline: 0;
}
h1 {
	font-size: 2em;
	margin: 0.67em 0;
}
abbr[title] {
	border-bottom: 1px dotted;
}
b, strong {
	font-weight: bold;
}
dfn {
	font-style: italic;
}
hr {
	-moz-box-sizing: content-box;
	box-sizing: content-box;
	height: 0;
}
mark {
	background: #ff0;
	color: #000;
}
code, kbd, pre, samp {
	font-family: monospace, serif;
	font-size: 1em;
}
pre {
	white-space: pre-wrap;
}
q {
	quotes: "\201C" "\201D" "\2018" "\2019";
}
small {
	font-size: 80%;
}
sub, sup {
	font-size: 75%;
	line-height: 0;
	position: relative;
	vertical-align: baseline;
}
sup {
	top: -0.5em;
}
sub {
	bottom: -0.25em;
}
img {
	border: 0;
}
svg:not(:root) {
	overflow: hidden;
}
figure {
	margin: 0;
}
fieldset {
	border: 1px solid #c0c0c0;
	margin: 0 2px;
	padding: 0.35em 0.625em 0.75em;
}
legend {
	border: 0;
	padding: 0;
}
button, input, select, textarea {
	font-family: inherit;
	font-size: 100%;
	margin: 0;
}
button, input {
	line-height: normal;
}
button, select {
	text-transform: none;
}
button, html input[type="button"], input[type="reset"], input[type="submit"] {
	-webkit-appearance: button;
	cursor: pointer;
}
button[disabled], html input[disabled] {
	cursor: default;
}
input[type="checkbox"], input[type="radio"] {
	box-sizing: border-box;
	padding: 0;
}
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-cancel-button, input[type="search"]::-webkit-search-decoration {
-webkit-appearance:none;
}
button::-moz-focus-inner, input::-moz-focus-inner {
border:0;
padding:0;
}
textarea {
	overflow: auto;
	vertical-align: top;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}