flickering box shadow

#main {border-radius: 5px; background-color:white; border:1px solid white;

animation: boxxy 2s infinite ease-in-out;
}

@keyframes boxxy{
0%,12%,18%,30%,37%,50%,58%,63%,70%,72%,80%,89%,95% {box-shadow: 0 0 3px 1px #fff;}

5%,10%,15%,20%,29%,36%,44%,49%,55%,68%,76%,85%,99% {box-shadow: 0 0 3px 0px #fff;}

14%,24%,32%,38%,46%,53%,59%,62%,66%,79%,82%,88%,92% {box-shadow: 0 0 3px 0.2px #fff;}

22%,25%,33%,40%,46%,52%,59%,67%,71%,78%,81%,91%,98% {box-shadow: 0 0 3px 0.5px #fff;}
}