bootstrap 模态框居中显示

.modal-dialog {

position: absolute !important;

top:50% !important;

left:50% !important;

transform:translate(-50%,-50%) !important;

-webkit-transform:translate(-50%,-50%) !important;

-moz-transform:translate(-50%,-50%) !important;

-ms-transform:translate(-50%,-50%) !important;

-o-transform:translate(-50%,-50%) !important;   

}