.zhutu{
    position: relative;

}
.jumpButton{
    width: 100%;
    max-width: 750px;
    position: absolute;
    display: flex;
    justify-content: space-evenly;
    flex-wrap: nowrap;
    flex-direction: row;
    align-items: stretch;
    bottom: 16%;
    transform: translateX(-50%);
    left: 50%;
}
.jumpButton img{
    width: 20%;
    border: none;
    background: transparent;
    cursor: pointer;
    animation: downSmall 1.5s infinite;
}

@keyframes downSmall {
    0% {
        transform: translateY(0)
    }

    50% {
        transform: translateY(-5px)
    }

    to {
        transform: translateY(0)
    }
}