._dash-loading {
  margin: auto;
  color: transparent;
  width: 0;
  height: 400px;
  text-align: center;
}

._dash-loading::before {
  content: '';
  display: inline-block;
  width: 3rem;
  height: 3rem;
  color: var(--header-background);
  vertical-align: text-bottom;
  border: 0.25em solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  -webkit-animation: spinner-border 0.75s linear infinite;
  animation: spinner-border 0.75s linear infinite;
  margin-top: 10rem;
}