JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper marg">
  <header>
    Header der 3 Boxen lang ist
  </header>
</div>
<article class="wrapper">
  <section>Artikel 1</section>
  <section>Artikel 2</section>
  <section>Artikel 3</section>
  <section>Artikel 4</section>
  <section>Artikel 5</section>
  <section>Artikel 6</section>
  <section>Artikel 7</section>
  <section>Artikel 8</section>
</article>

CSS

* {box-sizing: border-box;}
.wrapper {
  max-width: 90%;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 20px;
  grid-auto-rows: minmax(100px, auto);
}

.wrapper > section, header {
  border: 2px solid rgb(233,171,88);
  border-radius: 5px;
  background-color: rgba(233,171,88,.5);
  padding: 1em;
  color: #d9480f;
}

.marg {
  margin-bottom: 50px;
}

header {
  grid-column: 2 / 5;
  grid-row: 1;  
}