How can I change my code to obtain simpler form and brighter blinking dots [closed]

I want to obtain blinking dots one after one in one direction and then blinking have to go back, and all have to happen in the loop. I have created CSS code with Javascript according to first five dots. What can I do to make shorter all reqired code in CSS? Also I want to make not visible black backgrounds of the dots during blinking.

for (let i = 0; i < 40; i++) {
  const dots = document.createElement("div");
  document.body.appendChild(dots).classList.add("dots");
}

body {
  background-color: #737373;
  display: flex;
  justify-content: space-evenly;
  align-items: center;
  min-height: 100vh;
  overflow: hidden;
}

.dots {
  background-color: rgb(0, 0, 0);
  width: 20px;
  height: 20px;
  border-radius: 50%;
}

.dots:nth-of-type(1)::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  animation: bright 0.3s linear;
  background-color: rgb(255, 255, 255);
  box-shadow: 0 0 3px 3px rgb(255, 255, 255),
    0 0 5px 5px rgb(255, 255, 255), 0 0 12px 12px rgb(255, 255, 255);
  opacity: 0;
  animation-delay: 0s;
}

.dots:nth-of-type(2)::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  animation: bright 0.3s linear;
  background-color: rgb(255, 255, 255);
  box-shadow: 0 0 3px 3px rgb(255, 255, 255),
    0 0 5px 5px rgb(255, 255, 255), 0 0 12px 12px rgb(255, 255, 255);
  opacity: 0;
  animation-delay: 0.25s;
}

.dots:nth-of-type(3)::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  animation: bright 0.3s linear;
  background-color: rgb(255, 255, 255);
  box-shadow: 0 0 3px 3px rgb(255, 255, 255),
    0 0 5px 5px rgb(255, 255, 255), 0 0 12px 12px rgb(255, 255, 255);
  opacity: 0;
  animation-delay: 0.5s;
}

.dots:nth-of-type(4)::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  animation: bright 0.3s linear;
  background-color: rgb(255, 255, 255);
  box-shadow: 0 0 3px 3px rgb(255, 255, 255),
    0 0 5px 5px rgb(255, 255, 255), 0 0 12px 12px rgb(255, 255, 255);
  opacity: 0;
  animation-delay: 0.75s;
}

.dots:nth-of-type(5)::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  animation: bright 0.3s linear;
  background-color: rgb(255, 255, 255);
  box-shadow: 0 0 3px 3px rgb(255, 255, 255),
    0 0 5px 5px rgb(255, 255, 255), 0 0 12px 12px rgb(255, 255, 255);
  opacity: 0;
  animation-delay: 1s;
}

@keyframes bright {

  0%,
  100% {
    opacity: 0;
  }

  50% {
    opacity: 1;
  }
}