一般有一些元素标签是有边框和边距的。所以你需要初始化。
* { padding: 0 margin: 0 border: 0 }/*最简单的*//*较好的*/
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, font, 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 {
margin: 0
padding: 0
border: 0
outline: 0
font-size: 100%
vertical-align: baseline
background: transparent
}
body {
line-height: 1
}
ol, ul {
list-style: none
}
blockquote, q {
quotes: none
}
blockquote:before,blockquote:after,
q:before, q:after {
content: ''
content: none
}
/* remember to define focus styles! */
:focus {
outline: 0}
/* remember to highlight inserts somehow! */
ins {
text-decoration: none
}
del {
text-decoration: line-through
}
/* tables still need 'cellspacing="0"' in the markup */
table {
border-collapse: collapse
border-spacing: 0
}
你都重复设置了啊，最后面又设置了一次：body{ font-size:12pxtext-align:centermargin-top:30pxfont-family:Verdana}
