JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
    <title>Mockup</title>
    <meta charset="utf-8">
<!--[if lt IE 9]>
<script src="//html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->  
</head>
<body>

    <div class="wrapper">
    
        <div class="header">
            <img src="img/l1.png" alt="This is logo" width="279" height="105">

            <div class="headblock">
                <div class="topnav">
                    <ul>
                        <li><a href="#">Some</a></li>
                        <li><a href="#">Menu</a></li>
                        <li><a href="#">Items</a></li>
                        <li><a href="#">Test</a></li>
                        <li><a href="#">RSS</a></li>
                    </ul>
                </div>

                <form class="searchform">
                    <input class="searchfield" type="text" value="Test">
                    <input class="searchfield" type="text" value="Test">
                    <input class="searchfield" type="text" value="Test">
                    <input class="searchbutton" type="button" value="Go!">
                </form>

            </div>

            <nav class="clearfix">
                <ul>
                    <li><a href="#">Test</a></li>
                    <li><a href="#">Test</a></li>
                    <li><a href="#">Test</a></li>
                    <li><a href="#">Test</a></li>
                    <li><a href="#">Test</a></li>
                    <li><a href="#">Test</a></li>
                    <li><a href="#">Test</a></li>
                    <li><a href="#">Test</a></li>
                    <li><a href="#">Test</a></li>
                    <li><a href="#">Test</a></li>
                    <li><a href="#">Test</a></li>
                </ul>
            </nav>

        </div>

    </div> <!-- wrapper end -->


</body>
</html>

CSS

.clearfix:before,.clearfix:after{content:" ";display:table}.clearfix:after{clear:both}.clearfix{*zoom:1}

html,body{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}

a{
    color: #900;
    text-decoration: none;
}

/* ========================== */

.wrapper{
    width: 1000px;
    margin: 0 auto;
    font-size: 1em;
}

.header{
    background: #000;
}

.headblock{
    float: right;
    width: 650px;
}

.header img{
    float: left;
}
.header ul{
    list-style: none;
    margin: 0;
    padding: 0;
}
.topnav{
    float: right;
}
.topnav li,
nav li{
    float: left;
}
.topnav a{
    color: #B7A3A2;
    font-size: 0.813em;
}
form.searchform {
    clear: right;
    float: right;
}
nav{
    clear: both;
}