body {
  background-color: black;
  color: white;
  font-family: Verdana;
}

@keyframes img-1 {
  0% {
    opacity: 1;
  }
  44% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
  94% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@keyframes img-2 {
  0% {
    opacity: 0;
  }
  44% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  94% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

.wrapper {
  display: flex;
  position: relative;
  width: 300px;
  height: 300px;
}

.wrapper img:first-child {
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  width: 100%;
  opacity: 1;
  animation: img-1 1s infinite;  
}

.wrapper img:last-child {
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  width: 100%;
  opacity: 0;
  animation: img-2 1s infinite;
}