JSFiddle - React, Tailwind, and code Playground

HTML

<header>
    <nav class="topnav">
      <ul>
        <li><a href="#">Home</a></li>
        <li><a href="#">Shop</a></li>
        <li><a href="#">About Us</a></li>
        <li><a href="#">Contact</a></li>
      </ul>
    </nav>
  </header>

  <div class="content-container">
    <aside>
      <div class="about-me-wrapper">
        <h1>About me</h1>
        <img src="//unsplash.it/100/100" alt="random photo" class="text-wrap">
        <p>A bunch of random words A bunch of random words A bunch of random words A bunch of random words A bunch of random words A bunch of random words</p>
      </div>
      <div class="aside-card">
        <p>Sed dignissim lacinia nunc. Curabitur tortor. Pellentesque nibh. Aenean quam. In scelerisque sem at dolor. Maecenas mattis. Sed convallis tristique sem. Proin ut ligula vel nunc egestas porttitor. Morbi lectus risus, iaculis vel, suscipit quis, luctus non, massa. Fusce ac turpis quis ligula lacinia aliquet. Mauris ipsum</p>
      </div>
      <div class="aside-card">
        <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer nec odio. Praesent libero. Sed cursus ante dapibus diam. Sed nisi. Nulla quis sem at nibh elementum imperdiet. Duis sagittis ipsum. Praesent mauris. Fusce nec tellus sed augue semper porta. Mauris massa. Vestibulum lacinia arcu eget nulla. Class aptent taciti sociosqu ad litora</p>
      </div>
    </aside>
    <div class="sidebar">
      <ul>
        <li><a href="#">Example 1</a></li>
        <li><a href="#">Example 2</a></li>
        <li><a href="#">Example 3</a></li>
        <li><a href="#">Example 4</a></li>
        <li><a href="#">Example 5</a></li>
        <li><a href="#">Example 6</a></li>
        <li><a href="#">Example 7</a></li>
      </ul>
    </div>
    <article>
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer nec odio. Praesent libero. Sed cursus ante dapibus diam. Sed nisi. Nulla quis sem at nibh elementum imperdiet. Duis sagittis ipsum. Praesent mauris....

CSS

/* Global styles */
html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-size: 16px;
}

body {
  background-color: #d8d8d8;
}

header {
  background-color: #fff;
  color: #000;
  border-bottom: 3px solid #fa58f4;
  position: absolute;
  top: 0;
  width: 100%;
}

/* Top navbar styles */
.topnav ul {
  list-style-type: none;
  display: flex;
  justify-content: center;
}

.topnav li a {
  padding: 12px 12px;
  text-decoration: none;
  color: #000;
}

.topnav a:hover {
  text-decoration: underline;
}

/* about me style */
.text-wrap {
  float: left;
  margin: 5px;
}

.about-me-wrapper > h1 {
  text-align: center;
  text-decoration: underline;
}

/* main content styles */
.content-container {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-gap: 20px;
  margin: 4em 10px;
}

aside {
  grid-column: 1 / 4;
  grid-row: 1;
}

article {
  grid-column: 4 / 10;
  grid-row: 1;
}

/* Side navbar style, still needs work */
.sidebar {
  grid-column: 10 / 13;
  grid-row: 1;
}

.sidebar ul {
    background-color: #fff;
    list-style-type: none;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
    transition: 0.3s;
    margin-left: 0;  /* new */
    padding-left: 0; /* new */
}

.sidebar li a {
  text-decoration: none;
  color: #000;
}

.sidebar a:hover {
  text-decoration: underline;
  color: blue;
}

.sidebar ul:hover {
  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.2);
}

.about-me-wrapper {
  background-color: #fff;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
  transition: 0.3s;
}

.about-me-wrapper > h1 {
  font-size: 18px;
}

.about-me-wrapper:hover {
  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.2);
}

.aside-card {
  /*generic card for the left
  hand column -aside- that can be used
  multiple time */
  background-color: #fff;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
  transition: 0.3s;
}

.aside-card:hover {
  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.2);
}