bootatrap span IE

Question

基于bootatrap开发的项目，span 标签，在IE下面不兼容，错位，求指教

.input-group-addon {
  padding: 6px 12px;
  font-size: 14px;
  font-weight: normal;
  line-height: 1;
  color: #555555;
  text-align: center;
  background-color: #eeeeee;
  border: 1px solid #cccccc;
  border-radius: 4px;
}

Answer 1

Hack https://github.com/coliff/bootstrap-ie7

Answer 2

现在需要修改，咋办

Answer 3

bootstrap本来对IE就不友好