body * {
  box-sizing: border-box;
  flex-shrink: 0;
}
body {
  font-family: PingFangSC-Regular, Roboto, Helvetica Neue, Helvetica, Tahoma,
    Arial, PingFang SC-Light, Microsoft YaHei;
}
button {
  margin: 0;
  padding: 0;
  border: 1px solid transparent;
  outline: none;
  background-color: transparent;
}

button:active {
  opacity: 0.6;
}
.flex-col {
  display: flex;
  flex-direction: column;
}
.flex-row {
  display: flex;
  flex-direction: row;
}
.justify-start {
  display: flex;
  justify-content: flex-start;
}
.justify-center {
  display: flex;
  justify-content: center;
}

.justify-end {
  display: flex;
  justify-content: flex-end;
}
.justify-evenly {
  display: flex;
  justify-content: space-evenly;
}
.justify-around {
  display: flex;
  justify-content: space-around;
}
.justify-between {
  display: flex;
  justify-content: space-between;
}
.align-start {
  display: flex;
  align-items: flex-start;
}
.align-center {
  display: flex;
  align-items: center;
}
.align-end {
  display: flex;
  align-items: flex-end;
}
a {text-decoration:none;}
a:hover {text-decoration:underline;}
.clear{clear:both}
.clear{clear:both}body, ul, li, h1, h2, h3, h4, h5, h6, p, form, dl, dt, dd {
                    margin: 0px;
                    padding: 0px;
                    font-size: 12px;
                    font-weight: normal; }
ul { list-style: none; }
img { border-style: none; }
/** 清除内外边距 **/
body, h1, h2, h3, h4, h5, h6, hr, p, blockquote, /* structural elements 结构元素 */
dl, dt, dd, ul, ol, li, /* list elements 列表元素 */
pre, /* text formatting elements 文本格式元素 */
form, fieldset, legend, button, input, textarea, /* form elements 表单元素 */
th, td /* table elements 表格元素 */ {
  margin: 0;
  padding: 0;
}
/** 设置默认字体 **/
body,
button, input, select, textarea /* for ie */ {
  font: 14px/1.5 tahoma, \5b8b\4f53, sans-serif;
}
h1, h2, h3, h4, h5, h6 { font-size: 100%; font-weight: normal;}
address, cite, dfn, em, var { font-style: normal; } /* 将斜体扶正 */
code, kbd, pre, samp { font-family: courier new, courier, monospace; } /* 统一等宽字体 */
small { font-size: 12px; } /* 小于 12px 的中文很难阅读, 让 small 正常化 */
/** 重置列表元素 **/
ul, ol { list-style: none; }
/** 重置文本格式元素 **/
a { text-decoration: none; }
a:hover { text-decoration: underline; }
sup { vertical-align: text-top; } /* 重置, 减小对行高的影响 */
sub { vertical-align: text-bottom; }
/** 重置表单元素 **/
legend { color: #000; } /* for ie6 */
fieldset, img { border: 0; } /* img 搭车：让连接里的 img 无边框 */
button, input, select, textarea { font-size: 100%; } /* 使得表单元素在 ie 下能继承字体大小 */
/* 注：optgroup 没法扶正 */
/** 重置表格元素 **/
table { border-collapse: collapse; border-spacing: 0; }
/* 重置 HTML5 元素 */
article, aside, details, figcaption, figure, footer,header, hgroup, menu, nav, section,
summary, time, mark, audio, video {
  display: block;
  margin: 0;
  padding: 0;
}
mark { background: #ff0; }