JSFiddle - React, Tailwind, and code Playground

HTML

<div id="page">
    <div id="header">header :)</div>
    <div id="content">
        <div id="leftNav">
            left nav
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CSS

/** couleurs pour la demo **/
#header {background:yellow;}
#main {background:red;}
#leftNav {background:green;}
#rightNav {background:blue;}
#footer {background:purple;}

/** structure des colonnes **/
#content,#main { /* contexte de formatage */
    overflow:hidden;
    zoom:1;
}
 
#leftNav,#rightNav, #main {/* technique sioux pour aligner les colonnes */ 
    padding-bottom:32000px;
    margin-bottom:-32000px;
}
 
#leftNav { /* nav left donc float:left */
    float:left;
    width:200px;
}
 
#rightNav { /* nav right donc float:right */
    float:right;
    width:100px;
}