/* Reset CSS */
html {
  box-sizing: border-box; /* 设置盒模型为border-box，避免在计算布局时引起意外变化 */
  font-family: Arial, Verdana, "Microsoft Yahei", 微软雅黑, 宋体, Helvetica, sans-serif;
}
body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, code, form, fieldset, legend, input, textarea, p, blockquote, th, td, span, a {
  margin: 0;
  padding: 0;
}