.lines {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 100%;
  margin: auto;
  width: 90vw;
}
.lines .line {
  position: absolute;
  width: 1px;
  height: 100%;
  top: 0;
  left: 50%;
  background: rgba(255, 255, 255, 0.1);
  overflow: hidden;
}
.lines .line::after {
  content: "";
  display: block;
  position: absolute;
  height: 15vh;
  width: 100%;
  top: -50%;
  left: 0;
  background: -webkit-gradient(linear, left top, left bottom, from(rgba(255, 255, 255, 0)), color-stop(75%, #ffffff), to(#ffffff));
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0%, #ffffff 75%, #ffffff 100%);
  -webkit-animation: run 7s 0s infinite;
          animation: run 7s 0s infinite;
  -webkit-animation-fill-mode: forwards;
          animation-fill-mode: forwards;
  -webkit-animation-timing-function: cubic-bezier(0.4, 0.26, 0, 0.97);
          animation-timing-function: cubic-bezier(0.4, 0.26, 0, 0.97);
}
.lines .line:nth-child(1) {
  margin-left: -25%;
}
.lines .line:nth-child(1)::after {
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.lines .line:nth-child(3) {
  margin-left: 25%;
}
.lines .line:nth-child(3)::after {
  -webkit-animation-delay: 2.5s;
          animation-delay: 2.5s;
}

@-webkit-keyframes run {
  0% {
    top: -50%;
  }
  100% {
    top: 110%;
  }
}

@keyframes run {
  0% {
    top: -50%;
  }
  100% {
    top: 110%;
  }
}