html - 带有边距的 CSS flex child 装订线

Question

我有一个画廊布局，我想用边距分隔每个框。问题是每一行的最后一个框没有与网格对齐；右边还有空间，我怎么能不使用填充呢？ (这将迫使我添加另一个包装 div)

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
ul {
  list-style-type: none;
}
.flex {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-flex-wrap: wrap;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
}
.align-center {
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
}
.space-between {
  -webkit-box-pack: justify;
  -webkit-justify-content: space-between;
  -ms-flex-pack: justify;
  justify-content: space-between;
}
.container {
  max-width: 1000px;
  margin: 0 auto;
  height: 100%;
  padding: 0 1em;
  border: 1px solid;
}
nav {
  background: #464646;
  height: 70px;
}
.box {
  background: lightblue;
  padding: 1em;
  -webkit-box-flex: 0;
  -webkit-flex: 0 0 calc(50% - 1em);
  -ms-flex: 0 0 calc(50% - 1em);
  flex: 0 0 calc(50% - 1em);
  text-align: center;
  margin-right: 1em;
  margin-bottom: 1em;
}

<nav>
  <div class="container flex align-center space-between">

    <ul>
      <li>Logo</li>
    </ul>

    <ul>
      <li>Home</li>
    </ul>

  </div>
</nav>

<div class="container">

  <header>
    <h1>Header</h1>
  </header>

</div>

<div class="container">

  <div class="gallery flex">
    <div class="box">BOX 1</div>
    <div class="box">BOX 2</div>
    <div class="box">BOX 3</div>
  </div>

</div>

注意:我不能使用 flex grow: 1 因为我并不总是有两个连续的盒子。

我不能在两者之间使用空格，因为网格是动态的，例如，如果框的宽度为 33.33% 并且您有五个框，则第二行将有两个框，一个在左侧，第二个在左侧右侧。

Answer 1

方法#01:

分别在parnet和child上添加如下css(此方法只在连续只有2个boxes时有效):

/* For Parent Element */
.flex {
  justify-content: space-between;
}

/* For Child Element */
.flex-child {
  flex: 0 0 calc(50% - 0.5em);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
ul {
  list-style-type: none;
}
.flex {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-flex-wrap: wrap;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
}
.align-center {
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
}
.space-between {
  -webkit-box-pack: justify;
  -webkit-justify-content: space-between;
  -ms-flex-pack: justify;
  justify-content: space-between;
}
.container {
  max-width: 1000px;
  margin: 0 auto;
  height: 100%;
  padding: 0 1em;
  border: 1px solid;
}
nav {
  background: #464646;
  height: 70px;
}
.box {
  background: lightblue;
  padding: 1em;
  -webkit-box-flex: 0;
  -webkit-flex: 0 0 calc(50% - 0.5em);
  -ms-flex: 0 0 calc(50% - 0.5em);
  flex: 0 0 calc(50% - 0.5em);
  text-align: center;
  margin-bottom: 1em;
}

<nav>
  <div class="container flex align-center space-between">
    <ul>
      <li>Logo</li>
    </ul>
    <ul>
      <li>Home</li>
    </ul>
  </div>
</nav>
<div class="container">
  <header>
    <h1>Header</h1>
  </header>
</div>
<div class="container">
  <div class="gallery flex space-between">
    <div class="box">BOX 1</div>
    <div class="box">BOX 2</div>
    <div class="box">BOX 3</div>
    <div class="box">BOX 4</div>
    <div class="box">BOX 5</div>
    <div class="box">BOX 6</div>
    <div class="box">BOX 7</div>
    <div class="box">BOX 8</div>
    <div class="box">BOX 9</div>
  </div>
</div>

方法#02:

1. 在子元素的两侧添加边距。
2. 以相同数量的负边距从左/右扩展父项。

注意:如果出现水平滚动，请在 .gallery 的父级上添加 overflow: hidden。

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
ul {
  list-style-type: none;
}
.flex {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-flex-wrap: wrap;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  margin: 0 -0.5em;
}
.align-center {
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
}
.space-between {
  -webkit-box-pack: justify;
  -webkit-justify-content: space-between;
  -ms-flex-pack: justify;
  justify-content: space-between;
}
.container {
  max-width: 1000px;
  margin: 0 auto;
  height: 100%;
  padding: 0 1em;
  border: 1px solid;
}
nav {
  background: #464646;
  height: 70px;
}
.box {
  background: lightblue;
  padding: 1em;
  -webkit-box-flex: 0;
  -webkit-flex: 0 0 calc(50% - 1em);
  -ms-flex: 0 0 calc(50% - 1em);
  flex: 0 0 calc(50% - 1em);
  text-align: center;
  margin: 0 0.5em 1em;
}

<nav>
  <div class="container flex align-center space-between">
    <ul>
      <li>Logo</li>
    </ul>
    <ul>
      <li>Home</li>
    </ul>
  </div>
</nav>
<div class="container">
  <header>
    <h1>Header</h1>
  </header>
</div>
<div class="container">
  <div class="gallery flex">
    <div class="box">BOX 1</div>
    <div class="box">BOX 2</div>
    <div class="box">BOX 3</div>
  </div>
</div>