.loader {
  width: 400px;
  height: 32px;
  background-color: #000000;
  position: relative;
  overflow: hidden;
  border: 3px solid white;
}

.progress {
  width: 0%;
  height: 100%;
  background-color: #ffffff;
  position: absolute;
  top: 0;
  left: 0;
  animation: progress-animation 3s ease-in-out forwards infinite;
}

.progress::after {
  content: attr(data-percentage);
  position: absolute;
  top: 50%;
  left: 50%;
  font-weight: bold;
  transform: translate(-50%, -50%);
  font-size: 1rem;
  color: black;
}

@keyframes progress-animation {
  0% {
    width: 0%;
  }
  25% {
    width: 25%;
  }
  50% {
    width: 50%;
  }
  75% {
    width: 75%;
  }
  100% {
    width: 100%;
  }
}

@keyframes percentage-animation {
  0% {
    content: "0%";
  }
  25% {
    content: "25%";
  }
  50% {
    content: "50%";
  }
  75% {
    content: "75%";
  }
  100% {
    content: "100%";
  }
}

.progress::after {
  animation: percentage-animation 3s ease-in-out forwards infinite;
}