<li id="customize" class=" last"><a href="/test">
<i class="fa fa-Test Account"></i>
<span class="menu-text"><strong>Test Account</strong></span>
</a></li>

.fa-test.Account:before {
opacity: 0.3;
content: "";
background: url("icons/test.svg") no-repeat;
background-size: 30px 30px;
opacity: 0.3;
position: absolute;
width: 30px;
height: 31px;
}