.repo-signin-form .repo-signin-submit.is-submitting {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  cursor: progress;
  opacity: 1;
}

.repo-signin-form .repo-signin-submit.is-submitting::before {
  content: "";
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, .38);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: repo-signin-spin .8s linear infinite;
}

@keyframes repo-signin-spin {
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .repo-signin-form .repo-signin-submit.is-submitting::before { animation: none; }
}