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;
  vertical-align: baseline;
  box-sizing: border-box;
}
              
article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section{ 
    display:block;
}
blockquote:before,
blockquote:after,
q:before,
q:after {
    content: '';
    content: none;
}
a:hover {
    text-decoration: underline
}
ol,
ul {
    list-style: none
}
blockquote,
q {
    quotes: none
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}
:focus {
    outline: none
}
/*常用的宽度*/
.widthauto{position:relative; width:100%;}
.width980{ overflow:hidden; width:980px; position:relative; margin:0px auto;}
.fl{ float:left; }
.clearb{ clear:both;}