.bubble-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
  }
  
  .bubble-container span {
    position: absolute;
    display: block;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    opacity: 0.8;
    border-radius: 50%;
    animation: animate 25s linear infinite;
  }
  
  @keyframes animate {
    0% { transform: translateY(100vh) scale(0); }
    100% { transform: translateY(-10vh) scale(1); }
  }