/* 气泡出现消失 */
.advantage-one-bubble {
    opacity: 0;
    transition: opacity 4s;
}
.advantage-one-bubble.out-in-out {
    animation: bubble-animation 7s ease-in-out infinite;
}

@keyframes bubble-animation {
    0% {
        opacity: 0;
        transform: translateY(2.5rem);
    }

    30%,
    70% {
        opacity: 1;
        transform: translateY(0%);
    }

    90% {
        opacity: 0;
        transform: translateY(-2.5rem);
    }
}