<div class="container">
  <div class="item"></div>
</div>
@import url("https://fonts.googleapis.com/css2?family=Zen+Maru+Gothic:wght@400;700&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: #3090bd;
}

.container {
  max-width: min(85%, 800px);
  margin: 2rem auto;
}

.item {
  padding: 6rem 1rem;
  background: #eef61f;
  border-radius: 0.5rem;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.