css - How can i add effect hover on span in <a> -

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how can add background <span> when mouse hover <span> or <a>. 

<a href="" class="special"><span class="fa fa-facebook"></span> facebook</a>

enter image description here

css selecting elements. here want select span when parent <a> tag hovered. use a:hover > span. 

#activation:hover > #activated {    color:red;  }
<a id="activation" href="" class="special">    <span id="activated" class="fa fa-facebook">?</span>    <span>facebook</span>  </a>


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