.a-scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  z-index: 9999;
  pointer-events: none;
}

.a-scroll-progress__bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--text-color-highlight), var(--text-color-link));
  transition: width 0.1s linear;
}