如何垂直堆叠居中的div

Question

我似乎无法找到一种方法来垂直堆叠我的div，同时仍然将它们对齐在页面的中心。

这是我目前的html：

.loading-page {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.loading-page .image-container {
  position: relative;
  display: inline-block;
}

.loading-page .image-container .image-grey {
  display: block;
  -webkit-filter: grayscale(100%);
  filter: grayscale(1);
}

.loading-page .image-container:after {
  position: absolute;
  content: "";
  top: 0;
  left: 0%;
  width: var(--image-load);
  height: 100%;
  background-position: top left;
}

.counter {
  text-align: center;
  position: relative;
  width: 200px;
}

.counter h1 {
  color: black;
  font-size: 60px;
  font-weight: bold;
  margin-top: -10px;
  margin-bottom: -10px;
}

.counter hr {
  background: #000000;
  border: none;
  height: 1px;
}

<div class="loading-page">

  <div class="image-container" style="--image-load: 50%;">
    <style>
      .image-container:after {
        background-image: url(http://i.imgur.com/bZt9ZwE.png);
      }
    </style>
    <img class="image-grey" src="http://i.imgur.com/bZt9ZwE.png" />
  </div>
  <div class="counter">
    <h1>50%</h1>
    <hr/>
  </div>

</div>

一个工作的例子：

JsFiddle

目标是“50％”文本在图像下方，而两个div都是垂直和水平居中。图像大小将是动态的，因此我不能只用固定的宽度/高度设置所有内容并使用填充。

Answer 1

将flex-direction:column;设为.loading-page

body{
  margin:0px;
}

.loading-page {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.loading-page .image-container {
  position: relative;
  display: inline-block;
}

.loading-page .image-container .image-grey {
  display: block;
  -webkit-filter: grayscale(100%);
  filter: grayscale(1);
}

.loading-page .image-container:after {
  position: absolute;
  content: "";
  top: 0;
  left: 0%;
  width: var(--image-load);
  height: 100%;
  background-position: top left;
}

.counter {
  text-align: center;
  position: relative;
  width: 200px;
}

.counter h1 {
  color: black;
  font-size: 60px;
  font-weight: bold;
  margin-top: -10px;
  margin-bottom: -10px;
}

.counter hr {
  background: #000000;
  border: none;
  height: 1px;
}

<div class="loading-page">

  <div class="image-container" style="--image-load: 50%;">
    <style>
      .image-container:after {
        background-image: url(http://i.imgur.com/bZt9ZwE.png);
      }
    </style>
    <img class="image-grey" src="http://i.imgur.com/bZt9ZwE.png" />
  </div>
  <div class="counter">
    <h1>50%</h1>
    <hr/>
  </div>

</div>

Answer 2

干得好！提示：不要使用像素（px），它们无法响应...而是使用百分比作为度量单位以使其具有响应性。

编辑：我更新了我的答案......现在它响应了。希望能帮助到你！

    .loading-page {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.loading-page .image-container {
  position: relative;
  display: inline-block;
}

.loading-page .image-container .image-grey {
  display: block;
  -webkit-filter: grayscale(100%);
  filter: grayscale(1);
}

.loading-page .image-container:after {
  position: absolute;
  content: "";
  top: 0;
  left: 0%;
  width: var(--image-load);
  height: 100%;
  background-position: top left;
}

.counter {
  text-align: center;
  position: static;
  width: 200px;
}

.counter h1 {
  color: black;
  font-size: 60px;
  font-weight: bold;
  margin-top: 5%;
  margin-bottom: -5%;
}

.counter hr {
  background: #000000;
  border: none;
  height: 1px;
}

<div class="loading-page">

<div class="image-container" 
		 style="--image-load: 50%;">
	<style>.image-container:after { background-image: url(http://i.imgur.com/bZt9ZwE.png);}</style>
	<img class="image-grey" src="http://i.imgur.com/bZt9ZwE.png"/>
</div>
<div class="counter">
  <h1>50%</h1>
<hr/>
</div>

</div>