body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: rgb(45, 50, 80);
}
svg {
  width: 40px;
  height: 40px;
  animation: colorChange 3s linear 20;
  fill: white;

}
.pulse {
  width: 100px;
  height: 100px;
  background-color: #58ea00;
  color: white;
  border-radius: 50%;
  text-align: center;
  line-height: 100px;
  font-size: 48px;
  position: relative;;
}
.pulse:before, .pulse:after {
  content: '';
  position: absolute;
  left: -20px;
  top: -20px;
  right: -20px;
  bottom: -20px;
  border: 1px solid #58ea00;
  border-radius: 50%;
  animation: pulse 1.5s linear 20;
}
.pulse:after {
  animation-delay: .5s;
}
@keyframes pulse {
  0% {transform: scale(.5); opacity: 0;}
  50% {transform: scale(1); opacity: 1;}
  100% {transform: scale(1.2); opacity: 0;}

}
@keyframes colorChange {
  50% {fill: white;}
  80% {fill: #58ea00;}
  100% {fill: white;}

}