:root{
  --colorBgScrollStatus:#ff0000;
}

.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 10px;
  width: 0%;
  background-color: var(--colorBgScrollStatus);
  z-index: 9999;
  display:block;
  transition: width 0.2s ease; 
  box-shadow: 0 0 10px #0000007a;
}