/* Hintergrund */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none; /* Bubbles sind nicht interaktiv */
}

.bubble {
    position: absolute;
    border-radius: 15%;
    /* background-color: rgba(255, 255, 255, 0.5); */
    opacity: 0.8;
    animation: move 20s infinite ease-in-out;
}

@keyframes move {
    0% {
        transform: translateY(0);
        opacity: 0.5;
    }
    50% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100vh);
        opacity: 0;
    }
}