Question

我正在尝试将文本垂直对齐到其父容器的中心，但是它比中心稍微偏向一点。

CSS：

.caret-right {
    position: relative;
    display: block;
}

.caret-right:after {
    position: absolute;
    right: 5%;
    top: 50%;
    display: inline-block;
    vertical-align: middle;
    transition: .15s;
    -webkit-transition: .15s;
    -moz-transition: .15s;
    font-family: FontAwesome;
    content: "\f105"; /* fa-angle-right */
    font-size: 1.5em;
}
.caret-right:hover:after {
    right: 4%;
}

.box {
  border: 1px solid #ccc;
  padding: 1em;
}
.align-center {
  text-align: center;
}

HTML：

<a class="caret-right" href="#" title="Get Started">

  <div class="box">

    <p class="align-center">Get started now with <span class="color-theme-a">5 free lessons</span>.</p>

    <p class="align-center">No credit card needed</p>

  </div>

</a>

Answer 1

将transform: translateY(-50%);添加到您的.caret-right:after规则：

.caret-right:after {
    transform: translateY(-50%);
}

这正确地将你的元素50％的高度偏移到垂直居中你的插入符号：

＆＃13;

.caret-right {
  position: relative;
  display: block;
}
.caret-right:after {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  display: inline-block;
  vertical-align: middle;
  transition: .15s;
  -webkit-transition: .15s;
  -moz-transition: .15s;
  font-family: FontAwesome;
  content: "\f105";
  /* fa-angle-right */
  font-size: 1.5em;
}
.caret-right:hover:after {
  right: 4%;
}
.box {
  border: 1px solid #ccc;
  padding: 1em;
}
.align-center {
  text-align: center;
}

＆＃13;

<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.6.2/css/font-awesome.css" rel="stylesheet" />
<a class="caret-right" href="#" title="Get Started">
  <div class="box">
    <p class="align-center">Get started now with <span class="color-theme-a">5 free lessons</span>.</p>
    <p class="align-center">No credit card needed</p>
  </div>
</a>

＆＃13;

Answer 2

要完全垂直居中.caret-right:after，请保留50％top值并添加以下内容：

transform: translateY(-50%);

Answer 3

使用CSS3 transform属性的另一种方法是为行高.caret-right指定一个特定值，然后使用负上边距到行高的一半。< / p>

就个人而言，我更喜欢transform: translateY(-50%)规则，但知道如何使用其他方法做到这一点很好。

＆＃13;

.caret-right {
  position: relative;
  display: block;
}

.caret-right:after {
  outline: 1px dotted red;
  position: absolute;
  right: 5%;
  top: 50%;
  display: inline-block;
  transition: .15s;
  -webkit-transition: .15s;
  -moz-transition: .15s;
  font-family: FontAwesome;
  content: "\f105";
  /* fa-angle-right */
  font-size: 1.5em;
  line-height: 50px;
  margin-top: -25px;

}

.caret-right:hover:after {
  right: 4%;
}

.box {
  border: 1px solid #ccc;
  padding: 1em;
}

.align-center {
  text-align: center;
}

＆＃13;

<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.2/css/font-awesome.min.css" rel="stylesheet"/>
<a class="caret-right" href="#" title="Get Started">
  <div class="box">
    <p class="align-center">Get started now with <span class="color-theme-a">5 free lessons</span>.</p>
    <p class="align-center">No credit card needed</p>
  </div>
</a>

＆＃13;

垂直对齐：在父容器中的元素之后（jsfiddle）

3 个答案: