JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper">
        <div id="content-wrapper">
            <div id="content">content</div>
        </div>
        <div id="nav-search-block">
            <div id="nav-wrapper">
                <div id="nav">nav</div>
            </div>
            <div id="search-results-wrapper">
                <div id="search-results">search-results</div>
            </div>
        </div>
    </div>

CSS

#wrapper {
        display: table;
        width: 100%;
    }
    
    #nav-wrapper, 
    #search-results-wrapper {
        float: left;
        width: 50%;
    }
    
    #nav, 
    #search-results {
        color: #ffffff;
        background: #6699ff;
        padding: 10px;
        margin: 10px;
    }
    
    #nav-search-block {
        display: table-row-group;
    }
    
    #content-wrapper {
        display: table-footer-group;
    }
    
    #content {
        color: #ffffff;
        background: #cc0000;
        padding: 10px;
        margin: 10px;
    }