Css Programming Tutorials, Guides & Best Practices

.grid-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-flow: dense;
}

.grid-item {
  background-color: lightgray;
  border: 1px solid #333;
  padding: 10px;
}

<div class="grid-container">
  <div class="grid-item" style="grid-column: span 2;">Item 1</div>
  <div class="grid-item">Item 2</div>
  <div class="grid-item" style="grid-row: span 2;">Item 3</div>
  <div class="grid-item">Item 4</div>
</div>

<div class="flex-container">
  <div class="flex-item">1</div>
  <div class="flex-item">2</div>
  <div class="flex-item">3</div>
</div>

.flex-container {
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: 200px;
}

.flex-item {
  background-color: lightgreen;
  padding: 10px;
  border: 1px solid #ccc;
}