.modal-center {
  text-align: center;
}

.modal-center:before {
    display: inline-block;
    vertical-align: middle;
    content: " ";
    height: 100%;
  }
.modal-center-dialog {
  display: inline-block;
  text-align: center;
  vertical-align: middle;
}
.loader{
    border: 5px solid #f3f3f3;
    -webkit-animation: spin 1s linear infinite;
    animation: spin 1s linear infinite;
    border-top: 5px solid #555;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display:inline-block;
}
.loader-text {
    color:#fff;
    font-weight:normal;
    font-family:Arial;
}
/* Safari */
@-webkit-keyframes spin {
  0% { -webkit-transform: rotate(0deg); }
  100% { -webkit-transform: rotate(360deg); }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}