html - CSS 将元素保持在底部的中心

Question

我需要创建一个标签部分。容器应该有固定的填充，当标签换行到下一行时，它应该与顶行有间距。

问题是当它换行到下一行时，它不再居中对齐。如何保持容器中行与固定填充之间的间距？

.flex {
  display: flex;
}

.align-center {
  align-items: center;
}

.wrap {
  flex-wrap: wrap;
}

section {
  border: 1px solid grey;
  min-height: 40px;
  width: 400px;
  padding: 0 0.5em;
}

.item {
  background-color: hotpink;
  padding: 0.3em;
  margin-right: 0.4em;
  margin-bottom: 0.3em;
}

* {
  box-sizing: border-box;
}

<section class="flex align-center wrap">

  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>

</section>

Answer 1

您需要为 .flex container 定义相同的 top & bottom padding，这将保持.item 始终垂直居中，然后只需调整 child 的 margin 即可实现 它们之间的间距相等:

* {box-sizing: border-box}

.flex {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  border: 1px solid grey;
  min-height: 40px;
  width: 400px;
  padding: .5em .2em;
  animation: width 4s linear infinite alternate;
}

.item {
  background-color: hotpink;
  padding: .3em;
  margin: .2em;
}

@keyframes width {to {width: 100px}}

<section class="flex">
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
</section>