如何将图标对齐div元素中的中心？

Question

我想将图标居中于div元素“rectangle”。任何其他替代解决方案也受到欢迎。

body {
  background-color: black;
}

.rectangle {
  width: 125px;
	height: 125px;
	-webkit-border-radius: 5px;
	-moz-border-radius: 5px;
	border-radius: 5px;
	background-color: #fff;
}

h3 {
  color: #fff;
}

<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<div class="rectangle">
  <span><i class="fa fa-quora" aria-hidden="true" style="font-size: 75px;" align="center"></i></span>
</div>
<h3>Quora</h3>

Answer 1

将position: relative;添加到.rectangle以及以下CSS中的图标：

.fa-quora {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  }

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body {
  background-color: black;
}

.rectangle {
    width: 125px;
	height: 125px;
	-webkit-border-radius: 5px;
	-moz-border-radius: 5px;
	border-radius: 5px;
	background-color: #fff;
    position: relative;
}
.fa-quora {
   position: absolute;
   top: 50%;
   left: 50%;
   transform: translate(-50%, -50%);
}
h3 {
   color: #fff;
}

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<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<div class="rectangle">
  <span><i class="fa fa-quora" aria-hidden="true" style="font-size: 75px;"></i></span>
</div>
<h3>Quora</h3>

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Answer 2

将此添加到您的.rectangle课程

display: flex;
justify-content: center;
align-items: center;

示例代码段

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body {
  background-color: black;
}

.rectangle {
  width: 125px;
	height: 125px;
	-webkit-border-radius: 5px;
	-moz-border-radius: 5px;
	border-radius: 5px;
	background-color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
}

h3 {
  color: #fff;
}

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<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<div class="rectangle">
  <span><i class="fa fa-quora" aria-hidden="true" style="font-size: 75px;" align="center"></i></span>
</div>
<h3>Quora</h3>

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如果您想支持旧浏览器，请将其添加到.rectangle类

display: table-cell;
text-align: center;
vertical-align: middle;

示例代码段

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body {
  background-color: black;
}

.rectangle {
  width: 125px;
	height: 125px;
	-webkit-border-radius: 5px;
	-moz-border-radius: 5px;
	border-radius: 5px;
	background-color: #fff;
  display: table-cell;
  text-align: center;
  vertical-align: middle;
}

h3 {
  color: #fff;
}

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<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<div class="rectangle">
  <span><i class="fa fa-quora" aria-hidden="true" style="font-size: 75px;" align="center"></i></span>
</div>
<h3>Quora</h3>

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Answer 3

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body {
  background-color: black;
}

.rectangle {
  width: 125px;
	height: 125px;
	-webkit-border-radius: 5px;
	-moz-border-radius: 5px;
	border-radius: 5px;
	background-color: #fff;
	position: absolute;
	left: 50%;
}

h3 {
  color: #fff;
}

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<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<div class="rectangle">
  <span><i class="fa fa-quora" aria-hidden="true" style="font-size: 75px; position: absolute; left: 50%;"></i></span>
</div>
<h3>Quora</h3>

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Answer 4

我不确定你的要求......

您可以在padding-left课程的padding-top和rectangle中添加一些像素。之后，使用相同的像素数减小宽度和高度。但是除了Q之外的其他字符可以具有不同的渲染。

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body {
  background-color: black;
}

.rectangle {
    width: 98px;
    height: 98px;
    padding-top: 22px;
    padding-left: 22px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
    background-color: #fff;
}

h3 {
  color: #fff;
}

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<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
    <div class="rectangle">
        <span><i class="fa fa-quora" aria-hidden="true" style="font-size: 75px;" align="center"></i></span>
    </div>
<h3>Quora</h3>

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这是另一个没有固定高度的例子。它使用flex。

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body {
  background-color: black;
}

.rectangle {
    width:125px;
    display: flex;
    justify-content: center;
    align-items: center;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
    background-color: #fff;
}

h3 {
  color: #fff;
}

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<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<span class="rectangle">
  <span><i class="fa fa-quora" aria-hidden="true" style="font-size: 75px;" align="center"></i></span>
</span>
<h3>Quora</h3>

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