body {
  margin: 0;
  height: 100vh;
  background-color: #ff7a1a;
  overflow: hidden;
  position: relative;
}

.bubble {
  position: absolute;
  bottom: -100px;
  background-color: rgba(255, 255, 255, 0.35);
  border-radius: 50%;
  animation: float 10s infinite ease-in;
}

@keyframes float {
  0% {
    transform: translateY(0) scale(1);
    opacity: 0.6;
  }
  100% {
    transform: translateY(-110vh) scale(1.3);
    opacity: 0;
  }
}