JSFiddle - React, Tailwind, and code Playground

HTML

<div id="contain">
    <div id="left">1</div>
    <div id="filler"></div>
    <div id="right">2</div>
</div>

CSS

#left {
    text-decoration: none;
    display: inline-block;
    float: left;
    width: auto;
    padding: 0px 20px 0px 20px;
    height: 45px;
    text-align: center;
    line-height: 300%;
    background: #FF9000;
    color: #FFFFFF;
}
#navFiller {
    display: inline-block;
    position: fixed;
    float: left;
    width: auto;
    height: 45px;
    background: #FF9000;
}
#right {
    text-decoration: none;
    display: inline-block;
    float: right;
    width: auto;
    padding: 0px 20px 0px 20px;
    height: 45px;
    text-align: center;
    line-height: 300%;
    background: #FF9000;
    color: #FFFFFF;
}
#contain {
    width: 100%;
	height: 45px;
    padding: 0;
	margin: 0;
    display: inline;
}