#toast {
    visibility: hidden;
    max-width: 50%;
    margin: 0 auto;
    background-color: #333;
    color: #fff;
    text-align: center;
    border-radius: 5px;
    padding: 16px;
    position: fixed;
    z-index: 1000;/* 选择一个比地图更高的值 */
    left: 50%;
    top: 30px;
    font-size: 17px;
    transform: translateX(-50%);
    transition: visibility 0s, opacity 0.5s linear;
    opacity: 0;
}

#toast.show {
    visibility: visible;
    opacity: 1;
}