JSFiddle - React, Tailwind, and code Playground

HTML

<title>MY NAME</title>
    <body>
            <header>
                <mark><h1>MY NAME</h1></mark>
                <h2>DESCRIPTION</h2>
            </header> 
        
            <section id="upperContainer"><article id="leftBlock"></article><article id="rightBlock"></article></section>
            <section id="lowerContainer"><article id="leftBlock2"></article><article id="rightBlock2"></article></section>
        
    <footer>FOOTER</footer>
    </body>

CSS

/*CSS RESET*/
        html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}
/*CSS RESET*/
body
{
    background-color: white;
    width: 100%;
    max-width: 100%;
}


header
{
    width: 100%;
    max-width: 100%;
    
    height: 15vh;
    
    max-height: 8vw;
    background-color: white;
}

h1
{
    font-size: 5vw;
    max-height: 5vw;
    line-height: 1;
    color: #333333;
}

h2
{
    font-size: 2vw;
    max-height: 2vw;
    line-height: 0.1;
    color: #333333;
}

#upperContainer
{
    width: 100%;
    max-width: 100vw;
    max-height: 60vh;
    background-color: purple;
    text-align: center;


}

#leftBlock
{
    width: 50%;
    height: 60vh;
    max-width: 100vw;
    max-height: 60vh;
    height: 60vh;
    display: inline-block;
    vertical-align: middle;
    background-color: pink;

}

#rightBlock
{
    width: 50%;
    max-height: 60vh;
    background-color: yellow;
    display: inline-block;
    vertical-align: middle;
}

#lowerContainer
{
    width: 100%;
    max-width: 100vw;
    max-height: 60vh;
    background-color: purple;
    text-align:...