html - 在 flex 元素中水平居中 div

Question

我有 3 个 flex 元素(每个元素都是一个 div)。每个 flex 元素包含一个图像、2 个段落标签和一个 div(用于按钮)。我试图将每个 flex 元素中的每个按钮水平居中。

我已经尝试在 flex 容器中设置 justify-content:center; 但这没有用。 (我不认为这就是我想要的，因为我只希望 div 水平居中)我还尝试将 margin: 0 auto; 设置为按钮。这些似乎都不起作用。目前，每个 flex 元素的宽度为 33%，所以我将内部 div 设置为 position: absolute; 和 left: 16.5%;(容器宽度的一半).但这看起来不对。这是我得到的最接近的。关于如何使它看起来更好的任何想法？

HTML:

<section class="overview-section">
  <h2>Overview</h2>

  <div class="row">
    <div class="box">
      <img src="https://images.unsplash.com/photo-1550129460-d47c2040f9df?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=282&q=80">
      <p class="under-text">TITLE GOES HERE</p>
      <p class="txt">adsf adsf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf </p>
      <div class="btn">Learn more</div>
    </div>
    <div class="box">
      <img src="https://images.unsplash.com/photo-1550129460-d47c2040f9df?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=282&q=80">
      <p class="under-text">TITLE GOES HERE</p>
      <p class="txt">adsf adsf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf
      </p>
      <div class="btn">Learn More</div>
    </div>
    <div class="box">
      <img src="https://images.unsplash.com/photo-1550129460-d47c2040f9df?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=282&q=80">
      <p class="under-text">TITLE GOES HERE</p>
      <p class="txt">adsf adsf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf
      </p>
      <div class="btn">Learn more</div>
    </div>
  </div>

</section>

CSS:

@import url("https://fonts.googleapis.com/css?family=Oswald:300,400,500");
@import url("https://fonts.googleapis.com/css?family=Lato:400,700");
@import url("https://fonts.googleapis.com/css?family=Staatliches");

.row {
  display: flex;
  margin: 0 -50px;
}

.box {
  position: relative; /* button will be positioned relative to this container */
  border: 2px solid blue;
  width: 33%;
  height: 450px;
  margin: 0 50px;
}

.box img {
  width: 100%;
  height: 250px;
}

.under-text {
  font-family: "Staatliches", cursive;
  color: red;
  text-align: center;
}

.txt {
  padding-left: 20px;
}

.btn {
  position: absolute;
  left: 16.5%;
  bottom: 0;

  background-color: #4caf50;
  border: none;
  color: black;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  background-color: white;
  color: black;
  border: 2px solid #4caf50;
}

代码笔:https://codepen.io/anon/pen/rPqgVm

预期结果: flex 元素中的每个 div 应水平居中。

Answer 1

从中移除

.btn {
  position: absolute;
  left: 16.5%;
  bottom: 0;
}

并加入

.box {
display: flex;
flex-direction: column;
align-items: center;
}