.big_circle {
  background-image: url("Resurces/Images/Title Backgrounds/Tourism/1.jpg");
  animation: big_circle 5s infinite,
             change_background 10s infinite;
}

.middle_circle {
  background-image: url("Resurces/Images/Title Backgrounds/Tourism/1.jpg");
  animation: middle_circle 5s infinite,
             change_background 10s infinite;
}

.small_circle {
  background-image: url("Resurces/Images/Title Backgrounds/Tourism/1.jpg");
  animation: small_circle 5s infinite,
             change_background 10s infinite;
}

@keyframes change_background {
  0%, 47.5% {
    background-image: url("../Resurces/Images/Title Backgrounds/Tourism/1.jpg");
  }
  50%, 97.5% {
    background-image: url("../Resurces/Images/Title Backgrounds/Tourism/2.jpg");
  }
}