#burbujas-conteiner {
    position: fixed;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.burbuja {
    position: absolute;
    bottom: 0;
    background-color: rgba(118, 121, 121, 0.308);
    border-radius: 50%;
    opacity: 0;
    pointer-events: none;
    animation-fill-mode: forwards;
    animation-timing-function: ease-in;
}

@keyframes moverArriba {
    0% {
        opacity: 0;
        transform: translateY(0);
    }

    25% {
        opacity: 1;
    }

    100% {
        opacity: 0;
        transform: translateY(-100vh);
    }
}