CSS将项目保留在中心，边距为

Question

我需要创建一个标签部分。容器应该有固定的填充，当标签包裹到下一行时，它应该与顶行间隔。

问题在于当它包裹到下一行时，它不再与中心对齐。如何保持线条与固定填充物之间的间距？

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.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;
}

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<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>

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Answer 1

将margin-top: 0.3em添加到子div

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.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;
  margin-top: 0.3em;
}

* {
  box-sizing: border-box;
}

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<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>

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Answer 2

你需要定义相同的 top＆amp; padding 容器的底部 .flex，这将始终保持.item s 垂直居中，然后只需调整子 margin即可在它们之间实现等间距：

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* {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}}

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<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>

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