/*将标签默认的间距设为0*/
body,ul,p,h1,h2,h3,h4,h5,h6,dl,dd,input,selector,form{
    margin: 0;padding: 0;
}
 
/*让h标签继承body内设置的字体大小*/
h1,h2,h3,h4,h5,h6{
    font-size: 100%;
}
 
 
/*去掉默认的列表标签*/
ul{
    list-style: none;
}
 
/*设置em文字不倾斜*/
em{
    font-style: normal;
}
 
/*清除下划线*/
a{
    text-decoration: none;
}
 
/*清除图片的边框*/
img{
    border: none;
}
 
/*清楚margin-top塌陷和浮动问题*/
.clearfix:before,.clearfix:after{
    content: "";
    display: table;
}
 
.clearfix:after{
    clear: both;
}
/*解决ie清楚浮动的问题*/
.clearfix{
    zoom: 1;
}
 
/*向左浮动*/
.fl{
    float: left;
}
/*向右浮动*/
.fr{
    float: right;
}