html - 围绕在 css flexbox 中不起作用的内容空间对齐

Question

body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  background: url("assets/images/bg.jpg")no-repeat top;
  background-size: cover;
  background-attachment: fixed;
}

.category-container {
  width: 87%;
  margin: 3em auto;
}

.category-container h2 {
  margin: 0 auto;
  background-color: #fc0321;
  color: #fff;
  text-align: center;
  text-shadow: 2px 2px 4px #000;
  font-weight: 400;
  padding: 1%;
  width: 15%;
}

.thumb {
  width: 100%;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: space-around;
  align-content: space-around;
}

.thumb div {
  width: 36.8em;
  height: 22em;
}

.thumb img {
  width: 36.8em;
  height: 22em;
}

<section class="category-container">
  <h2>Category</h2>
  <div class="thumb">
    <div><img src="assets/images/header1.jpg" /></div>
    <div><img src="assets/images/header2.jpg" /></div>
    <div><img src="assets/images/header3.jpg" /></div>
    <div><img src="assets/images/header4.jpeg" /></div>
  </div>
</section>

我在 css flexbox.justify-content: space-around 中有问题，但 align-content: space-around 不起作用，align-content: space-between 也不起作用。为什么它不起作用？有人可以帮助解决 css flexbox align-content: space-around 和 align-content: space-between 中的这个问题吗？

Answer 1

它不工作 align-content:space-between 因为 flexbox 没有高度或任何 child 的任何填充。

如果 flexbox 有任何会增加拇指高度的高度或填充，flexbox 将执行 align-content:space-between。

证明内容是正确的，因为它有 100% 的宽度来做间隔。

我已经给出了拇指高度，现在看到它正在对齐内容中心。

body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  background: url("assets/images/bg.jpg")no-repeat top;
  background-size: cover;
  background-attachment: fixed;
}

.category-container {
  width: 87%;
  margin: 3em auto;
}

.category-container h2 {
  margin: 0 auto;
  background-color: #fc0321;
  color: #fff;
  text-align: center;
  text-shadow: 2px 2px 4px #000;
  font-weight: 400;
  padding: 1%;
  width: 15%;
}

.thumb {
  width: 100%;
  height:3500px;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: space-around;
  align-content: space-around;

}

.thumb div {
  width: 36.8em;
  height: 22em;
}

.thumb img {
  width: 36.8em;
  height: 22em;
}

<section class="category-container">
  <h2>Category</h2>
  <div class="thumb">
    <div><img src="assets/images/header1.jpg" /></div>
    <div><img src="assets/images/header2.jpg" /></div>
    <div><img src="assets/images/header3.jpg" /></div>
    <div><img src="assets/images/header4.jpeg" /></div>
  </div>
</section>