body{
  margin: 0;
  padding: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.progress-bar{
  background: #555;
  width: 600px;
  height: 30px;
  position: relative;
  border-radius: 25px;
  padding: 10px;
}

.progress-bar span{
  background: #1DC4E7;
  display: block;
  height: 100%;
  border-radius: 25px;
  position: relative;
}

.progress-bar span:after{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background-image: -webkit-gradient(linear, 0 0, 100% 100%,
    color-stop(.25, rgba(255, 255, 255, .2)),
    color-stop(.25, transparent),
    color-stop(.5, transparent),
    color-stop(.5, rgba(255, 255, 255, .2)),
    color-stop(.75, rgba(255, 255, 255, .2)),
    color-stop(.75, transparent), to(transparent)
    );
  background-size: 50px 50px;
  animation: move 2s linear infinite;
  border-radius: 25px;
}

@-webkit-keyframes move{
  0%{
    background-position: 0 0;
  }
  100%{
    background-position: 50% 50%;
  }
}