.mobile-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
/* 媒体查询 */
@media screen and (max-width: 768px) {
    .mobile-nav {
        display: block;
    }
}
@media screen and (min-width: 769px) and (max-width: 1024px)  {
    .mobile-nav {
        display: none;
    }
}
@media screen and (min-width: 1025px) {
    .mobile-nav {
        display: none;
    }
}