3.清除浮动:
.clear:after{
content:"";
display:block;
clear:both;
}
4.外边距的溢出
选择器:before{
content:"";
display:table;
}
3.清除浮动:
.clear:after{
content:"";
display:block;
clear:both;
}
4.外边距的溢出
选择器:before{
content:"";
display:table;
}