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</svg>
!

CSS 

              
                body {
  background: #000;
  padding: 20px;
}

.red {
  stroke: #DF474F;
  stroke-width: 2;
  stroke-linecap : round;
  stroke-dasharray: 100; 
  animation: red-anim 40s linear forwards infinite;
}

@keyframes red-anim {
  0% {
    stroke-dashoffset: 500;
  }
  50% {
    stroke-dashoffset: 1000;
  }  
  100% {
    stroke-dashoffset: 500;
  } 
}

.white {
  stroke: #fff;
  stroke-width: 1.9;
  stroke-linecap : round;
  stroke-dasharray: 400; 
  animation: white-anim 20s linear forwards infinite;
}

@keyframes white-anim {
  0% {
    stroke-dashoffset: 200;
  }
  50% {
    stroke-dashoffset: 2000;
  }  
  100% {
    stroke-dashoffset: 200;
  } 
}
!

JS
!
999px

Console