*{
	margin: 0px;
	padding: 0px;
}
ul {
	list-style-type:none;
}
li {
	float: left;
}
img {
	vertical-align: top; /* 解决图片底测有空白缝隙的问题 */
}
a{
	color: #555555;
	font-size: 0.8em;
	text-decoration:none;
}
a:hover{
	color: #1A3187;
}
header, section, footer, aside, nav, main, article, figure ,div{
    display: block; 
}
.w {  /* 版心的公共类 */
	min-width: 990px;
	margin: 0 auto;  
}
.fl { /*  浮动的公共类 */
	float: left;
}
.fr {
	float: right;
}