html, body {
  height: 100%;
  min-height: 100%;
}

.loading-icon {
  height: 100%;
  min-height: 100%;
  display: -ms-flex;
  display: -webkit-flex;
  display: flex;
  -ms-align-items: center;
  -webkit-align-items: center;
  align-items: center;
  justify-content: center;
  -ms-align-items: center;
  -webkit-justify-content: center;
  background-color: #f4f4f4;
}

i.fa.fa-spinner.fa-spin.fa-5x.fa-fw {
  color: #6a6a6a;
}