Bootstrap 3模态位置

@media screen and (min-width: 768px) {
    .modal-dialog {
        left: 50%;
        right: auto;
        width: 624px;
    }
}

如果您想在中心设置窗口,则必须使用以下样式:

.modal-dialog{
   position: absolute;
   left: 50%;
   /* now you must set a margin left under zero - value is a half width your window */
   margin-left: -312px;
   /* this same situation is with height - example */
   height: 500px;
   top: 50%;
   margin-top: -250px;
}