JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <header>
        <div id="site-title"><a href="#">Site Title</a></div>
        <div id="search">
            <form>
                <input type="search" placeholder="Search..." />
            </form>
        </div>
    </header>
</body>

CSS

body {
    font-family: Arial, sans-serif;
}
header {
    overflow: hidden;
    background-color: black;
}
a {
    text-decoration: none;
    color: white;
}
#site-title {
    float: left;
    margin-right: 50px;
    background-color: green;
    font-size: 28px;
}
#search {
    float: left;
    background-color: red;
    margin-top: 5px
}
form {
    margin-top:5px;
}
input {
    width:10em; height:1.25em;
    margin:0; border:2px solid #888; padding:0;
    font:inherit; vertical-align:baseline;
}