#loading-bar {
  height: 3px;
  position: fixed;
  top: 0;
  z-index: 1000;
  &::-webkit-progress-bar {
    background-color: transparent;
  }
}

#loading-bar {
  height: 3px;
  position: fixed;
  top: 0;
  z-index: 1000;
  background: transparent;
  &::-webkit-progress-bar {
    background-color: transparent;
  }
}

Fix progress bar background transparency on non webkit
Fix progress bar background transparency on non webkit
