gap

gap: 0;

gap: 10%;

gap: 1em;

gap: 10px 20px;

gap: calc(20px + 10%);

<section class="default-example" id="default-example">
  <div class="example-container">
    <div class="transition-all" id="example-element">
      <div>One</div>
      <div>Two</div>
      <div>Three</div>
      <div>Four</div>
      <div>Five</div>
    </div>
  </div>
</section>

#example-element {
  border: 1px solid #c5c5c5;
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: 200px;
}

#example-element > div {
  background-color: rgba(0, 0, 255, 0.2);
  border: 3px solid blue;
}

/* 一个 <length> 值 */
gap: 20px;
gap: 1em;
gap: 3vmin;
gap: 0.5cm;

/* 一个 <percentage> 值 */
gap: 16%;
gap: 100%;

/* 两个 <length> 值 */
gap: 20px 10px;
gap: 1em 0.5em;
gap: 3vmin 2vmax;
gap: 0.5cm 2mm;

/* 一个或两个 <percentage> 值 */
gap: 16% 100%;
gap: 21px 82%;

/* calc() 值 */
gap: calc(10% + 20px);
gap: calc(20px + 10%) calc(10% - 5px);

/* 全局值 */
gap: inherit;
gap: initial;
gap: revert;
gap: revert-layer;
gap: unset;

<div id="flexbox">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</div>

#flexbox {
  display: flex;
  flex-wrap: wrap;
  width: 300px;
  gap: 20px 5px;
}

#flexbox > div {
  border: 1px solid green;
  background-color: lime;
  flex: 1 1 auto;
  width: 100px;
  height: 50px;
}

<div id="grid">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</div>

#grid {
  display: grid;
  height: 200px;
  grid-template: repeat(3, 1fr) / repeat(3, 1fr);
  gap: 20px 5px;
}

#grid > div {
  border: 1px solid green;
  background-color: lime;
}

<p class="content-box">
  这是使用 CSS <code>gap</code> 属性创建的具有 40px
  列间距的多栏文本。你不觉得这很有趣和令人兴奋吗？我当然是这么认为的！！！
</p>

.content-box {
  column-count: 3;
  gap: 40px;
}