body {
  margin: 0;
}
.progress {
  width: 400px;
  max-width: 85vw;
  height: 4px;
  position: absolute;
  bottom: 49vh;
  left: 50%;
  background: rgb(0, 0, 0);;
  transform: translate(-50%, -50%);
  overflow: hidden;
  z-index: 1000;
}
.progress:after {
  content: '';
  display: block;
  width: 100%;
  height: 4px;
  background: rgb(239, 108, 0);;
  animation: load 1.5s linear;
}
@-moz-keyframes load {
  0% {
    width: 0;
  }
  10% {
    width: 5%;
  }
  20% {
    width: 15%;
  }
  30% {
    width: 25%;
  }
  40% {
    width: 30%;
  }
  50% {
    width: 44%;
  }
  60% {
    width: 50%;
  }
  70% {
    width: 72%;
  }
  80% {
    width: 84%;
  }
  90% {
    width: 92%;
  }
  100% {
    width: 100%;
  }
}
@-webkit-keyframes load {
  0% {
    width: 0;
  }
  10% {
    width: 5%;
  }
  20% {
    width: 15%;
  }
  30% {
    width: 25%;
  }
  40% {
    width: 30%;
  }
  50% {
    width: 44%;
  }
  60% {
    width: 50%;
  }
  70% {
    width: 72%;
  }
  80% {
    width: 84%;
  }
  90% {
    width: 92%;
  }
  100% {
    width: 100%;
  }
}