#app-loading {
  display: none;
}
#app-loading.app-loading {
  display: block;
  margin: 0 auto;
  z-index: 20;
  position: absolute;
  top: 0;
  left: -5px;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  align-content: center;
}
.app-loading-text {
  position: relative;
  text-align: center;
  font-family:Arial, Helvetica, sans-serif;
  font-style: italic;
  line-height: 1.2rem;
  flex: auto;
}
.app-loading-content {
  position: absolute;
  border: 16px solid #f3f3f3;
  border-top-color: #3498db;
  border-radius: 50%;
  width: 150px;
  height: 150px;
  top: calc(50% - 91px);
  left: calc(50% - 91px);
  -webkit-animation: spin 1.5s linear infinite;
  animation: spin 1.5s linear infinite;
}
@-webkit-keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(1turn);
  }
}
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(1turn);
  }
}