JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<nav class="navbar navbar-default navbar-fixed-top">
    <div class="col-xs-12">
        <div class="container">

            <div class="navbar-collapse collapse" id="navbar-collapse">
                <ul class="nav navbar-nav navbar-right">
                    <li><a href="/cards">AAA</a></li> 
                    <li><a href="/cards">BBB</a></li>
                    <li><a href="/cards">CCC</a></li>
                </ul>
            </div>

        </div>
    </div>
</nav>

<div id="content"></div>

<footer id="footer">
    
    <div class="row">
        <div class="col-md4 col-xs-12">111</div>
        <div class="col-md4 col-xs-12">222</div>
        <div class="col-md4 col-xs-12">333</div>
    </div>
    
</footer>

CSS

#footer {
    min-height: 50px;
}

#content {
    padding-top: 50px;
}