Vertically centering Bootstrap modal window

Question

I would like to center my modal on the viewport (middle) I tried to add some css properties

 .modal { position: fixed; top:50%; left:50%; }   

Answer 1

My choice, just a little CSS: ( NOT working in IE8 )

.modal.fade .modal-dialog {
    transform: translate(-50%, -80%);
}

.modal.in .modal-dialog {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    margin-top: 0px;
}

You can play with the first rule to change how the modal appears.

Using: Bootstrap 3.3.4