#bottom_div {
    width: 100%;
    height: 70px;
    background-color: #1a1a1a;
    display: flex;
    justify-content: space-around;
    align-items: center;
    text-decoration: none;
    position: relative; /* 修改为相对定位 */
    bottom: 0; /* 确保它在底部 */
    margin-top: auto; /* 自动调整顶部边距，确保其在内容底部 */
}

#bottom_div img {
    height: 70px;
}

#support_div li {
    display: inline-block;
    font-size: 30px;
    font-weight: normal;
}

#support_div li img {
    width: 20px;
    height: 20px;
}