@-webkit-keyframes progress1 {
  0% {
    -webkit-transform: scalex(0);
            transform: scalex(0);
    opacity: .5;
  }
  90% {
    -webkit-transform: scalex(1);
            transform: scalex(1);
    opacity: 1;
  }
  92% {
    -webkit-transform: scalex(1);
            transform: scalex(1);
    opacity: 1;
  }
  100% {
    -webkit-transform: scalex(1);
            transform: scalex(1);
    opacity: 0;
  }
}

@keyframes progress1 {
  0% {
    -webkit-transform: scalex(0);
            transform: scalex(0);
    opacity: .5;
  }
  90% {
    -webkit-transform: scalex(1);
            transform: scalex(1);
    opacity: 1;
  }
  92% {
    -webkit-transform: scalex(1);
            transform: scalex(1);
    opacity: 1;
  }
  100% {
    -webkit-transform: scalex(1);
            transform: scalex(1);
    opacity: 0;
  }
}
@-webkit-keyframes progress2 {
  0% {
    -webkit-transform: scale(0.3, 0.8) translatez(0);
            transform: scale(0.3, 0.8) translatez(0);
    opacity: 0;
  }
  90% {
    -webkit-transform: scale(1, 1) translatex(300px) translatez(0);
            transform: scale(1, 1) translatex(300px) translatez(0);
    opacity: 1;
  }
  100% {
    -webkit-transform: scale(1, 1) translatex(300px) translatez(0);
            transform: scale(1, 1) translatex(300px) translatez(0);
    opacity: 0;
  }
}
@keyframes progress2 {
  0% {
    -webkit-transform: scale(0.3, 0.8) translatez(0);
            transform: scale(0.3, 0.8) translatez(0);
    opacity: 0;
  }
  90% {
    -webkit-transform: scale(1, 1) translatex(300px) translatez(0);
            transform: scale(1, 1) translatex(300px) translatez(0);
    opacity: 1;
  }
  100% {
    -webkit-transform: scale(1, 1) translatex(300px) translatez(0);
            transform: scale(1, 1) translatex(300px) translatez(0);
    opacity: 0;
  }
}
.line {
  position: absolute;
  top: 50%;
  width: 300px;
  left: 50%;
  margin-left: -150px;
  height: 3px;
  background: rgba(255, 255, 255, 0.1);
}
.line:before {
  -webkit-animation: progress1 4s infinite;
          animation: progress1 4s infinite;
  -webkit-transform-origin: 0 0;
          transform-origin: 0 0;
  content: "";
  display: block;
  width: 300px;
  height: 100%;
  background: -webkit-linear-gradient(left, rgba(255, 255, 255, 0.1) 10%, rgba(255, 255, 255, 0.4) 80%, white);
  background: linear-gradient(to right, rgba(255, 255, 255, 0.1) 10%, rgba(255, 255, 255, 0.4) 80%, white);
}