.progress {
  display: block;
  text-align: center;
  width: 0;
  top: 0;
  position: fixed;
  z-index: 100;
  height: 3px;
  background: $red;
  transition: width .4s;

  &.hide {
    opacity: 0;
    transition: opacity 1.4s;
  }
}