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/*
<button type="button"><span class="glyphicon glyphicon-refresh refreshing"></span> Refresh</button>
*/
.refreshing {
    -webkit-animation:spin 1s linear infinite;
    -moz-animation:spin 1s linear infinite;
    animation:spin 1s linear infinite;
}
@-moz-keyframes spin { 100% { -moz-transform: rotate(360deg); } }
@-webkit-keyframes spin { 100% { -webkit-transform: rotate(360deg); } }
@keyframes spin { 100% { -webkit-transform: rotate(360deg); transform:rotate(360deg); } }


/* center of the screen */
.popup {
    position: fixed;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

.middle {
    width: 100%;
    height: 520px;

    position: absolute;
    top:0;
    bottom: 0;

    margin: auto;
}