$size: 80px;
$speed: 3s;
$peakopacity:0.7;




  .arrows {
    /**/
    position: absolute;
    top:50%;
    left:50%;
    /**/
    width:$size;
    height:$size;
    transform:translate(-50%,-50%);
    &:before {
      content: '';
      position: absolute;
      width:100%;
      height:100%;
      border-left:$size/3 solid rgba(0,0,0,$peakopacity);
      border-bottom:$size/3 solid rgba(0,0,0,$peakopacity);
      transform:translate($size/3,$size*4/3)rotate(-45deg);
      animation: arrows $speed linear infinite;
    }
    &:after {
      content: '';
      position: absolute;
      width:100%;
      height:100%;
      border-left:$size/3 solid rgba(0,0,0,$peakopacity);
      border-bottom:$size/3 solid rgba(0,0,0,$peakopacity);
      transform:translate($size*2/3,0px)rotate(-45deg) ;
      animation: arrows $speed linear infinite $speed/-2;
    }
  }

@keyframes arrows {
  0% {
      border-left:$size/3 solid rgba(0,0,0,0);
      border-bottom:$size/3 solid rgba(0,0,0,0);
      transform:translate($size/-6,$size*4/-6)rotate(-45deg) ;
  }
  10%, 90% {
      border-left:$size/3 solid rgba(0,0,0,0);
      border-bottom:$size/3 solid rgba(0,0,0,0);
  }
  50% {
      border-left:$size/3 solid rgba(0,0,0,$peakopacity);
      border-bottom:$size/3 solid rgba(0,0,0,$peakopacity);
      transform:translate($size/-6,0px)rotate(-45deg) ;
  }
  100% {
      border-left:$size/3 solid rgba(0,0,0,0);
      border-bottom:$size/3 solid rgba(0,0,0,0);
      transform:translate($size/-6,$size*4/6)rotate(-45deg) ;
  }
}