.grid-container {
  display: grid;
  /* Automatically adjust column count based on available space.
     'auto-fit' will expand items to fill extra space if fewer than max fit.
     'minmax(250px, 1fr)' ensures items are at least 250px wide and share space equally. */
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  padding: 20px;
  background-color: #f9f9f9;
}

.grid-item {
  background-color: #e0f7fa; /* Light blue */
  border: 1px solid #00bcd4; /* Cyan */
  border-radius: 5px;
  padding: 20px;
  text-align: center;
  min-height: 120px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: sans-serif;
  font-size: 1.2em;
  color: #333;
}

/* Example HTML structure:
<div class="grid-container">
  <div class="grid-item">Item 1</div>
  <div class="grid-item">Item 2</div>
  <div class="grid-item">Item 3</div>
  <div class="grid-item">Item 4</div>
  <div class="grid-item">Item 5</div>
  <div class="grid-item">Item 6</div>
</div>
*/