Add the CSS link to your website source code on header.
                <code class="big">
                    &lt;<span class="red">head</span>&gt;
                    <br/><span class="dots">...</span>
                    <br/>&lt;<span class="red">link</span> <span class="green">rel</span>=<span class="yellow">"stylesheet"</span> <span class="green">type</span>=<span class="yellow">"text/css"</span> <span class="green">href</span>=<span class="yellow">"your_website_domain/css_root/flaticon.css"</span>&gt