<li >
<a class="btn btn-default btn-product product-ic" href="#service" role="button">Advisors</a>
</li>

.btn-product{
text-align: left;
    width: 100%;
    background-color: #FEC006;
    border-bottom: 4px solid #FE9700;
    border-top: 1px solid rgba(82, 174, 110, 0.6);
    border-left: 2px solid rgba(254, 163, 0, 0.77);
    border-right: 0;
    border-radius: 8px;
    color: #333;
    font-size: 18px;
    padding-right: 5px;
    margin-top: 11px;
}
.btn-product:hover,
.btn-product:focus {
    background-color: #fff;
    color: #555;
}
 a.product-ic::before{
  font-family: fontAwesome;
  content: "f19c0a0";
  float:left;
}
.btn-product::after{
  font-family: fontAwesome;
  content: "f0540a0";
  float:right;
}