body {
    margin: 0;
    overflow: hidden;
    background: #000; /* Black background */
}

#bubble-container {
    position: absolute;
    width: 100%;
    height: 100%;
}

.bubble {
    position: absolute;
    bottom: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3); /* Semi-transparent white */
    box-shadow: inset -5px -5px 10px rgba(0, 0, 0, 0.2), 
                inset 5px 5px 10px rgba(255, 255, 255, 0.5), 
                0 0 10px rgba(255, 255, 255, 0.3); /* 3D glossy effect */
    animation: floatUp linear infinite;
    transition: transform 0.2s ease-out;
    will-change: transform;
}

/* Floating animation */
@keyframes floatUp {
    from {
        transform: translateY(0);
        opacity: 1;
    }
    to {
        transform: translateY(-100vh);
        opacity: 0;
    }
}