<!-- Learned from https://dev.to/mustapha/css-grid-illustrated-introduction-52l5 -->

<div class="grid-container">
    <div class="grid-item">grid item 1</div>
    <div class="grid-item">grid item 2</div>
    <div class="grid-item">grid item 3</div>
    <div class="grid-item">grid item 4</div>
    <div class="grid-item">grid item 5</div>
    <div class="grid-item">grid item 6</div>
    <div class="grid-item">grid item 7</div>
    <div class="grid-item">grid item 8</div>
    <div class="grid-item">grid item 9</div>
</div>
/* Grid implementation */
.grid-container {
  max-width: 500px;
  border: 1.5px solid var(--text-color);
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(4, minmax(100px, 1fr));
  grid-template-rows: repeat(3, minmax(100px, 1fr));
}

.grid-container .grid-item {
  border: 1.5px solid var(--text-color);
  text-align: center;
  padding: 0.5rem;
}

.grid-container .grid-item:nth-child(3) {
  grid-column: 1 / span 2;
  grid-row: 1 / span 2;
}











:root {
  --bg-color: #3057e1;
  --text-color: #fefefe;
}
body,
html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-color);
  color: var(--text-color);
  overflow-x: hidden;
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  font-size: 24px;
  display: flex;
  justify-content: center;
  align-items: center;
}
body::before {
  pointer-events: none;
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0.18;
  background-size: 50px 50px;
  background-image: linear-gradient(
      transparent 0%,
      transparent 98%,
      var(--text-color) 98%,
      var(--text-color) 100%
    ),
    linear-gradient(
      90deg,
      transparent 0%,
      transparent 98%,
      var(--text-color) 98%,
      var(--text-color) 100%
    );
}
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External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://codepen.io/navinnavi19/pen/aboQoVX.js