我需要有條件地突出顯示現有應用程序的菜單項。為了突出顯示該項目，我為該特定項目使用了底部邊框。但是已經有一個正在應用的填充并且突出顯示的行需要在底部（附上圖像以供參考）.menulist {  background: white;  color: black;  font-family: 'Times New Roman', Times, serif;  transition: height .3s;  z-index: 9;  width: 100%;}.menulist .menulist-menu-bar {  display: flex;  align-items: center;  flex-wrap: wrap;  padding: 8px;  justify-content: flex-start;  position: relative;  justify-content: inherit;}.menulist .menulist_nav {  padding-left: 0;  list-style: none;  font-size: 14px;  line-height: 1.71;  font-weight: normal;  margin: 0;  display: flex;  flex-wrap: wrap;  align-content: center;  align-items: stretch;  height: 100%;}.menulist_bottom_border {  border-bottom: 2px solid;  border-color: gray;  margin-left: 20px;}<header class="menulist">  <div class="menulist-menu-bar">    <div>      <ul class="menulist_nav">        <div class="menulist_bottom_border">nav1</div>        <div>nav2</div>        <div>nav3</div>      </ul>    </div>  </div></header>