如何在父div中水平居中三个div？

Question

我知道这个问题经常被问到,但我似乎永远无法让它发挥作用.你能告诉我什么是错的吗？

我在#container div中有三个div,我想并排放在一起.#container是1000px宽(我希望保持这种方式).这是我的代码:

#container {
  margin-top: 500px;
  position: absolute;
  width: 1000px;
}
.related-article {
  background-color: #D6A400;
  display: inline-block;
  width: 230px;
  height: 300px;
  border-radius: 30px;
  margin-bottom: 0px;
}
.related-article > img {
  width: 200px;
  height: 150px;
  border-radius: 15px;
  margin-top: 15px;
}
.related-article > h3 {
  font-size: 15px;
  width: 180px;
  text-align: justify;
  margin-left: auto;
  margin-right: auto;
  color: #f1f1f1;
  font-family: Abel, serif;
  margin-bottom: none;
}
a {
  text-decoration: none;
}
#right {
  float: right;
}
#left {
  float: left;
}
#center {
  margin-left: 385px;
  margin-right: 385px;
}

<div id="container">
  <h2>Here's what you'll do!</h2>
  <div id="left">
    <a href="#" class="related-article first" align="middle">
      <img src="download.jpeg" alt="T-rex">
      <h3>Constructing amazing fossils you never even dreamed of</h3>
    </a>
  </div>
  <div id="center">
    <a href="#" class="related-article second" align="middle">
      <img src="fossil-fish-10-lg.jpg" alt="Fish">
      <h3>Studying ancient marine biology</h3>
    </a>
  </div>
  <div id="right">
    <a href="#" class="related-article third" align="middle">
      <img src="fossil.turtle2.jpg" alt="Turtle">
      <h3>Uncovering the world's greatest mysteries</h3>
    </a>
  </div>
</div>

所有的帮助将很高兴.

Answer 1

你可以使用flexbox这么简单:

#container {
/*     margin-top: 500px; */
  width: 1000px;
  margin: 0 auto;
}
.related-article {
  background-color: #D6A400;
  display: inline-block;
  border-radius: 30px;
  margin-bottom: 0px;
}
.related-article > img {
    width: 200px;
    height: 150px;
    border-radius: 15px;
    margin-top: 15px;
}
.related-article > h3 {
  font-size: 15px;
  width: 180px;
  text-align: justify;
  margin-left: auto;
  margin-right: auto;
  color: #f1f1f1;
  font-family: Abel, serif;
  margin-bottom: none;
}
a {
    text-decoration: none;
}

}
#container {
    width: 1000px;
}

.related-article {
  background-color: #D6A400;
  display: inline-block;
  width: 230px;
  height: 300px;
  border-radius: 30px;
  margin-bottom: 0px;
}
.related-article > img {
    width: 200px;
    height: 150px;
    border-radius: 15px;
    margin-top: 15px;
}
.related-article > h3 {
  font-size: 15px;
  width: 180px;
  text-align: justify;
  margin-left: auto;
  margin-right: auto;
  color: #f1f1f1;
  font-family: Abel, serif;
  margin-bottom: none;
}
a {
    text-decoration: none;
}
.box {
  margin-right: 10px;
    width: 230px;
  height: 300px;
  }

.flex-container {
  display: flex;
  align-items: center;
  justify-content: center;
}

<div id="container">
        <h2>Here's what you'll do!</h2>
        <div class="flex-container">
        <div id="left" class="box">
          <a href="#" class="related-article first" align="middle">
            <img src="download.jpeg" alt="T-rex">
            <h3>Constructing amazing fossils you never even dreamed of</h3>
          </a>
          </div>
          <div id="center"  class="box">
          <a href="#" class="related-article second" align="middle">
            <img src="fossil-fish-10-lg.jpg" alt="Fish">
            <h3>Studying ancient marine biology</h3>
          </a>
          </div>
          <div id="right"  class="box">
          <a href="#" class="related-article third" align="middle">
            <img src="fossil.turtle2.jpg" alt="Turtle">
            <h3>Uncovering the world's greatest mysteries</h3>
          </a>
          </div>
          </div>
        </div>

Answer 2

使用的解决方案display: flex.在这里阅读更多关于flexbox的信息

1. 适用display: flex于容器
2. 添加flex: 1到水平居中的所有孩子.

h2 {
  margin-top: 500px;
}
#container {
  position: absolute;
  width: 1000px;
  display: flex;
  text-align: center;
}
#container div {
  flex: 1;
}
.related-article {
  background-color: #D6A400;
  display: inline-block;
  width: 230px;
  height: 300px;
  border-radius: 30px;
  margin-bottom: 0px;
}
.related-article > img {
  width: 200px;
  height: 150px;
  border-radius: 15px;
  margin-top: 15px;
}
.related-article > h3 {
  font-size: 15px;
  width: 180px;
  text-align: justify;
  margin-left: auto;
  margin-right: auto;
  color: #f1f1f1;
  font-family: Abel, serif;
  margin-bottom: none;
}
a {
  text-decoration: none;
}

<h2>Here's what you'll do!</h2>
<div id="container">
  <div id="left">
    <a href="#" class="related-article first" align="middle">
      <img src="download.jpeg" alt="T-rex">
      <h3>Constructing amazing fossils you never even dreamed of</h3>
    </a>
  </div>
  <div id="center">
    <a href="#" class="related-article second" align="middle">
      <img src="fossil-fish-10-lg.jpg" alt="Fish">
      <h3>Studying ancient marine biology</h3>
    </a>
  </div>
  <div id="right">
    <a href="#" class="related-article third" align="middle">
      <img src="fossil.turtle2.jpg" alt="Turtle">
      <h3>Uncovering the world's greatest mysteries</h3>
    </a>
  </div>
</div>