html - CSS - Center Font-awesome 图标

Question

如何让 FontAwesome 图标在方 block 内居中？

此时，除 facebook 图标外，所有图标都或多或少地放置在右侧，尤其是 soundcloude 图标。

我一直在使用“w3schools - Social Media Buttons”示例，当正方形按比例缩小时似乎会出现此问题。

.fa {
  padding: 15px;
  text-align: center;
  vertical-align:middle;
  text-decoration: none;
  margin: 15px 3px; 
  border-radius: 50%;
  width: 7.5px;
  height: 7.5px;
  font-size: 15px;
  line-height: 7.5px !important;
}

.fa {
  background: #F0F0F0;
  color: #282828;
}


.fa-facebook:hover {
  background: #3B5998;
  color: white;
  line-height: inherit;
}

.fa-youtube:hover {
  background: #bb0000;
  color: white;
  line-height: inherit;
}

.fa-instagram:hover {
  background: #125688;
  color: white;
  line-height: inherit;
}

.fa-soundcloud:hover {
  background: #ff5500;
  color: white;
  line-height: inherit;
}

<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<a href="#" class="fa fa-facebook"></a>
<a href="#" class="fa fa-youtube"></a>
<a href="#" class="fa fa-instagram"></a>
<a href="#" class="fa fa-soundcloud"></a>

Answer 1

去掉不必要的填充(不给图标留下空间)，让元素的width/height/line-height确定它们的布局。

之前:

padding: 15px;
width: 7.5px; 
height: 7.5px;
line-height: 7.5px !important;

之后:

width: 30px;
height: 30px;
line-height: 30px !important;

您还可以从 :hover 状态中删除一些冗余样式。

实例:

.fa {
  text-align: center;
  vertical-align: middle;
  text-decoration: none;
  margin: 15px 3px;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  font-size: 15px;
  line-height: 30px !important;
}

.fa {
  background: #F0F0F0;
  color: #282828;
}

.fa:hover {
  color: #fff;
}

.fa-facebook:hover {
  background: #3B5998;
}

.fa-youtube:hover {
  background: #bb0000;
}

.fa-instagram:hover {
  background: #125688;
}

.fa-soundcloud:hover {
  background: #ff5500;
}

<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" />
<a href="#" class="fa fa-facebook"></a>
<a href="#" class="fa fa-youtube"></a>
<a href="#" class="fa fa-instagram"></a>
<a href="#" class="fa fa-soundcloud"></a>