body {
  margin: 100px;
}

.yttre-box {
  padding: 50px;
  background-color: #FF6347;
}

.inre-box {
  padding: 20px;
  background-color: #6495ED;
}

.animation-box {
  padding: 30px;
  background-color: #FFD700;
  animation: flyttaBox 2s infinite alternate;
}

@keyframes flyttaBox {
  0% { transform: translateX(0); }
  100% { transform: translateX(200px); }
}

.sista-box {
  margin: 50px;
  background-color: #32CD32;
}