.yi-hui-up-link-list .link:hover {
    filter: grayscale(0%); /* 鼠标悬停时恢复原色 */
}
.yi-hui-up-link-list {
    padding-top: 10px;
    display: flex;
    flex-direction: row;
    height: 30px;
    align-items: flex-start; /* 垂直居中 */
    flex-wrap: wrap;
}
.yi-hui-up-link-list .link{
    filter: grayscale(100%); /* 将图标变为灰色 */
    transition: filter 0.3s ease; /* 添加过渡效果 */
    padding-right: 5px;
    height:30px;
    display: flex; /* 启用 Flexbox */
    justify-content: center; /* 水平居中 */
    align-items: center; /* 垂直居中 */
}
.yi-hui-up-link-list .link img, .yi-hui-up-link-list  .link a{
    width: 24px;
    height: 24px;
}


#profile_block{
    display: none;
}
#top_nav{
    /* display: none; */
    /* opacity:0.5; */
    /* background-color: black; */
     background-color: rgb(0, 0, 0, 0.5); 
}
.navbar-branding{
    display: none;
}
.navbar > nav .navbar-left > *:nth-child(2) {
    margin-left: 0;
}