.water-bubbles {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
    top: 0;
    left: 0;
    pointer-events: none;
}

.bubble {
    position: absolute;
    bottom: -100px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    animation: rise linear infinite;
}

@keyframes rise {
    0% {
        transform: translateY(0) scale(1);
        opacity: 0.6;
    }
    100% {
        transform: translateY(-120vh) scale(1.5);
        opacity: 0;
    }
}