WDD 130 | CSS Layouts: Grid Alignment Properties

W04 Learning Activities: Using CSS Layouts

Overview

Mastering CSS Flex and Grid can be challenging. This activity highlights some of the most relevant layouts and the principles behind them.

Prepare

When do I use CSS Flex versus CSS Grid?

Depending on the desired layout, you can often make either method work. You can even use them together, such as using flex to align items within a grid item.

Choose Flex

Simple Layouts: CSS Flex is ideal for one-dimensional layouts like navigation, or any group of items that need to be shown side by side or one on top of the other.
Alignment: Flex is great at aligning items horizontally or vertically.
Dynamic Content: Flex is often ideal for layouts with dynamic content where items sizes may vary.

Choose Grid

Complex Layouts: CSS Grid is generally more robust, allowing you to create two-dimensional layouts for common structures like tables, calendars, merged cells, and more.
Fixed Width Layouts: Grid is suitable for fixed-width layouts, where item sizes are known.
Overlap and Layering: Grid supports overlapping and the layering of the items.

Common Layout Methods

Define the direction of the Flex items using flex-direction: (row/column); (row is default).
```
display: flex;
flex-direction: column;
```
Centering Horizontally and Vertically: The following code centers the child item both horizontally and vertically using CSS Grid. Of course, this code is applied to the parent, grid container.
```
display: grid;
place-items: center;
```
Centering can also be controlled with the following code for both Flex and Grid:
```
display: flex; /* or grid */
justify-content: center;
align-items: center;
```

Activity Instructions

In the week04 folder, open the file named layout-exercises.html.
Use Live/Five Server to open the file in the browser.
Complete the three exercises. The following images are screenshots of the solutions:

Check Your Understanding

Attempt to complete the exercises on your own before looking at this example solution.

.flex {
  background-color: #aba;
  display: flex;
  justify-content: center;
  align-items: center;
}

.grid {
  background-color: #abb;
  display: grid;
  place-items: center;
}

* Either place-items or align-items/justify-content can be used to for exercise.

.container2 {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
}

.container3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;  /* or grid-template-columns: repeat(3, 1fr); */
}
              
.columns-3 {
  grid-column: 1/4; /* or grid-column: span 3; */
}

There is also a solution file is named layout-exercises-solutions.html and the corresponding CSS file is named layout-exercises-solutions.css in the week04 folder.