CSS Grid: Responsive Columns with `minmax` and `auto-fit`

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px; /* Space between grid items */
  padding: 20px;
  background-color: #e8e8e8;
}

.grid-item {
  background-color: #f9f9f9;
  padding: 20px;
  border: 1px solid #ddd;
  text-align: center;
}

How it works: The `display: grid` property initializes the grid container. `grid-template-columns: repeat(auto-fit, minmax(250px, 1fr))` is key for responsiveness. `auto-fit` fills the row with as many columns as possible. `minmax(250px, 1fr)` ensures each column is at least 250px wide but can grow to fill available space equally (`1fr`). The `gap` property adds consistent spacing between grid items, improving readability and layout.