bootstrap modal-footer
为什么加上 :before,:after
伪对象选择符,而且内容是 display:table, line-height: 0;
,实际测试时去掉 也没有影响啊
.modal-footer:before, .modal-footer:after {
display: table;
content: "";
line-height: 0;
}
clearfix
http://stackoverflow.com/questions/14973317/understanding-bootstraps-clearfix-class