/**箭头**/
.arrow-container-up {
    top: 60vh;
    position: absolute;
    display: flex;
    justify-content: center;
    margin-top: 6%;
    width: 100%;
    z-index: 9999;
}

.arrow-up {
    position: absolute;
    width: 2.1rem;
    height: 0.48rem;
    opacity: 0;
    transform: scale(0.3);
    animation: move-arrow-up 3s ease-out infinite;
}

.arrow-up:first-child {
    animation: move-arrow-up 3s ease-out 1s infinite;
}

.arrow-up:nth-child(2) {
    animation: move-arrow-up 3s ease-out 2s infinite;
}

.arrow-up:before,
.arrow-up:after,
.arrow-down:before,
.arrow-down:after {
    content: "";
    position: absolute;
    top: 0;
    height: 100%;
    width: 50%;
    background: #2c3e50;
}

.arrow-up:before {
    left: 0;
    transform: skewY(-30deg);
}

.arrow-up:after {
    right: 0;
    width: 50%;
    transform: skewY(30deg);
}

@keyframes move-arrow-up {
    25% {
        opacity: 1;
        transform: translateY(4.8rem) scale(0.5);
    }

    33.3% {
        opacity: 1;
        transform: translateY(3.12rem);
    }

    66.6% {
        opacity: 1;
        transform: translateY(2.28rem);
    }

    100% {
        opacity: 0;
    }
}

.arrow-container-down {
    top: 30px;
    left: 0;
    position: absolute;
    display: flex;
    justify-content: center;
    margin-top: 3%;
    width: 100%;
    z-index: 9999;
}


.arrow-down {
    position: absolute;
    width: 2.1rem;
    height: 0.48rem;
    opacity: 0;
    transform: scale(0.3);
    animation: move-arrow-down 3s ease-out infinite;
}

.arrow-down:first-child {
    animation: move-arrow-down 3s ease-out 1s infinite;
}

.arrow-down:nth-child(2) {
    animation: move-arrow-down 3s ease-out 2s infinite;
}

.arrow-down:before {
    left: 0;
    transform: skewY(30deg);
}

.arrow-down:after {
    right: 0;
    width: 50%;
    transform: skewY(-30deg);
}

@keyframes move-arrow-down {
    25% {
        opacity: 1;
    }

    33.3% {
        opacity: 1;
        transform: translateY(2.28rem);
    }

    66.6% {
        opacity: 1;
        transform: translateY(3.12rem);
    }

    100% {
        opacity: 0;
        transform: translateY(4.8rem) scale(0.5);
    }
}

/**箭头**/