.nav-transition-bar {
  content: "";
  background: var(--rt-color-button-primary-background);
  z-index: 9999;
  width: 0;
  height: 3px;
  transition: width 2s cubic-bezier(.1, .05, 0, 1);
  position: fixed;
  top: 0;
  left: 0;
}

body.navigating .nav-transition-bar {
  animation: 2s cubic-bezier(.1, .05, 0, 1) forwards nav-progress;
}

@keyframes nav-progress {
  from {
    width: 0;
  }

  to {
    width: 80%;
  }
}