JSFiddle - React, Tailwind, and code Playground

HTML

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

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 > div, 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;  
}