.page-header {
    position: sticky;
    top: 0px;
}

.admin-menu ul {
    display: flex;
}

.admin-menu a {
    color: inherit;
    text-decoration: none;
    display: block;
    padding: 10px 20px;
}

.admin-menu li:nth-child(2) {
    margin-left: auto;
}