JSFiddle - React, Tailwind, and code Playground

HTML

<aside>
    <nav>
        <div class="nav-header">
            <figure>
                <img src="http://placehold.it/140x100" alt="" />
            </figure>
        </div>
        <ul>
            <li>Item 1</li>
            <li>Item 2</li>
            <li>Item 3</li>
            <li>Item 4</li>
            <li>Item 5</li>
            <li>Item 6</li>
        </ul>
    </nav>
</aside>
<header>Header Centered</header>
<div class="container">
    <section>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
        <div>Scroll</div>
    </section>
</div>

CSS

body, html {
    height: 100%;
    margin: 0;
}
aside {
    background: lightgreen;
    width: 120px;
    position: fixed;
    height: 100%;
    left: 0;
    top: 0;
}
ul {
    list-style: none;
}
section {
    background: lightblue;
    margin-top: 60px;
    height: 100%;
}
header {
    background: yellow;
    height: 60px;
    z-index: 99;
    position: fixed;
    top: 0;
    width: 100%;
    left: 0;
    margin-left: 120px;
    text-align: center;
}
.container {
    text-align: center;
    margin-left: 120px;
    min-height: 100%;
    position: relative;
    left: 0;
}
figure {
    margin: 0;
}
img {
    height: 60px;
    width: 100%;
}