javascript - 我如何应用 css 边框和 css 填充

Question

我需要有条件地突出显示现有应用程序的菜单项。为了突出显示该元素，我正在为该特定元素使用底部边框。但是已经有一个正在应用的填充，并且突出显示的行需要在底部(附图供引用)

.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>

Answer 1

兄弟，可以了。看到这个:-

.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;
    }

    .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 class="menulist_bottom_border">nav2</div>
        <div class="menulist_bottom_border">nav3</div>
      </ul>
    </div>
  </div>
</header>

您看到了意想不到的事情，因为只有一个 div 具有类菜单列表底部边框。由于大多数元素都具有 flex 显示属性，所以它看起来像这样。