.progress {
  box-sizing: border-box;
  display: block;
  background-color: rgba(0, 0, 0, 0.1);
  width: 100%;
  height: 4px;
}
.progress *,
.progress *::before,
.progress *::after {
  box-sizing: inherit;
}
.progress > .bar {
  height: 100%;
  width: 0;
  background-color: #007bff;
  font-size: 12px;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  transition: all 0.2s ease-in-out;
}