/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
	font-style: normal;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
    display: block;
}
body {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
/* blockquote, q {
    quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
} */
table {
    border-collapse: collapse;
    border-spacing: 0;
}

/* 去除a标签的默认下划线 */
a {
 text-decoration: none;
}
/* 去除a标签的默认颜色 */
a {
 color: inherit;
}
/* 去除a标签被点击时的外部轮廓线 */
a:focus {
 outline: none;
}
/* 去除a标签的不同状态下的下划线 */
a:link,
a:visited,
a:hover,
a:active {
 text-decoration: none;
}

/* public style*/


.flex_box{
	display: flex;
}
.flex_center{
	justify-content: center;
	align-items: center;
}
.flex_row{
	flex-direction: row;
	flex-wrap: wrap;
}
.grid_box{
	display: grid;
}

.border_bottom{
	border-bottom: 1px solid #000;
}

.sticky_nav{
	position: sticky;
	top: 0;
	left: 0;
	z-index: 99;
}