Beginner to javascript and web development here. I have the following code. I am trying to manipulate the css for the #blog_nav element, but I am unable to get anything to render. A call to $("#blog_nav).length returns 0, which makes me believe the element does not yet exist for some reason. When I call $("#" + selected_page + "_nav").css("color": "red") in the inspect console after the page has loaded, it works fine. Any help is appreciated. Thanks  
index.html
<!DOCTYPE html>
<html>
    <head>
        <title>title</title>
        <script src="js/jquery.js"> </script>
        <script type="text/javascript" src="js/site_navigation.js"></script>
    </head>
    <body>
        <aside id="right_container"></aside>
        <script type="text/javascript">
            loadSideNav("blog");
        </script>
    </body>
</html>
site_navigation.js
function loadSideNav(selected_page) {
    $("#right_container").load("components.html #side_nav");
    console.log($('#blog_nav').length); // returns 0
    $("#" + selected_page + "_nav").css("color": "red"); // doesn't work
}
components.html
<nav id="side_nav">
    <ul id="side_nav_list">
        <li><a id="blog_nav" class="nav_link" href="index.html">blog</a></li>
        <li><a id="projects_nav" class="nav_link" href="index.html">projects</a></li>
    </ul>
</nav>
