#burbuja-contenedor {
  position: relative;
  overflow: hidden;
  /*background: #0b132b;*/
  color: #0b132b;
  padding: 60px;
  border-radius: 12px;
}
.burbuja {
  position: absolute;
  bottom: -100px;
  background: rgba(0, 150, 255, 0.25);
  border-radius: 50%;
  animation: flotar linear infinite;
}
@keyframes flotar {
  0% { transform: translateY(0) scale(1); opacity: 1; }
  100% { transform: translateY(-800px) scale(1.5); opacity: 0; }
}