selector{
    position: relative;
    animation: lightning 4s ease-out infinite;
}

@keyframes lightning{
  0%{
    filter: brightness(1);
  }
  
  86%{
    filter: brightness(1);
  }
  
  87.75%{
    filter: brightness(1.8);
  }
  
  89.5%{
    filter: brightness(1.3);
  }
  
  93%{
    filter: brightness(3);
  }
  
  100%{
    filter: brightness(1);
  }
}