一种方法是使用inline-blockdisplay并将其 居中 对齐-参见下面的演示：
.wrapper > * {
display: inline-block;
vertical-align: middle;
}
.blue {
color: blue;
}
.white {
color: white;
}
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<div class="col-md-4 wrapper">
<span class="fa-stack fa-2x">
<i class="fa fa-circle fa-stack-2x blue"></i>
<i class="fa fa-wifi fa-stack-1x white"></i>
</span>
<h4 class="blue">Free wifi</h4>
</div>
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