.rubium-login-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: linear-gradient(
        to bottom,
        rgba(41, 11, 5, 0.85),
        rgba(0, 0, 0, 1)
    );
    overflow: hidden;
}

.bubble {
    position: absolute;
    bottom: -50px;
    background-color: rgba(157, 14, 22, 0.3);
    border-radius: 50%;
    opacity: 0.6;
    animation: rise linear infinite;
}

@keyframes rise {
    to {
        transform: translateY(-110vh) translateX(var(--x-move));
        opacity: 0;
    }
}