JSFiddle - React, Tailwind, and code Playground

HTML

<header class="header">
            <nav>
                <div id="nav-one">
                <?php wp_nav_menu( array( 'theme_location' =>   'social-menu' , 'container_class' => 'bmenu' )); ?>
                </div>
            </nav>
            <div id="header-inner">
                <img src="<?php bloginfo('stylesheet_directory'); ?>/images/logo.png" alt="logo">
            </div>
</header>



<div id="main">
    <article id="main-content">
		<div id="iframe">
			<iframe name="background" src="http://examplewebsite.com/Home" frameborder="0" ><p>Your browser does not support iframes.</p></iframe>  
        </div> 
    </article>

</div>

<footer>
    
    <nav>
        <div id="nav-one">
            <?php wp_nav_menu( array( 'theme_location' =>   'footer-menu' , 'container_class' => 'cmenu' )); ?>
        </div>
    </nav>
     
</footer>

<?php wp_footer(); ?>

CSS

body {
    margin: 0;
    padding: 0;
    color: white;
}

header {
    padding: 0.7%;
    z-index: 1;
    position: absolute;
}
.bmenu li{
	display: inline-block;
}

.bmenu img{
    height: 75px;
}

#nav-one ul{
    float: left;
}

#nav-one li{
    display: inline-block;

}

#header-inner img{
    margin-left: auto;
    margin-right:auto;
    width:  300px;
    height: auto;

}


.cmenu li{
    display: inline-block;
    padding: 20px 50px;
}

.cmenu ul{
    margin-left: 15%;
    margin-top: 32%;
    width: 100%;
    z-index: 1;
    position: fixed;
}

iframe:first-child {
  opacity: .99; 
}


iframe {
    position: fixed;
    z-index: -1;
    min-width: 100%;
    min-height: 100%;
    float: left;
    }

footer{
    width: 100%;
    overflow: hidden;
    z-index: 1;
    position: fixed;

}