css-notes/14. Grid/README.md

CSS GRID

Lesson Objectives

1. What is CSS Grid?
2. Basic Terminology
3. Grid Container
4. Placing Grid Lines
5. Grid Areas
6. Attaching Elements to the Grid
7. Grid Item Overlap
8. Grid Spaces
9. Alignment
10. Resources

What is CSS Grid

CSS grid is a generalized layout system with its emphasis on rows and columns.

Basic Terminology

Grid container - An element that defines a grid-formatting context for its contents.

Grid item - A thing that participates in grid layout within a grid-formatting context.

Grid track - A continuous run between two adjacent grid lines. A grid row or column.

Grid cell - Any space bounded by four grid lines, with no grid lines running through it.

Grid area - Any rectangular area bounded by four grid lines and made up of one or more grid cells.

Grid Container

index.html

<div class="container">
  <div id="item1" class=""> <p>Item 1</p> </div>
  <div id="item2" class=""> <p>Item 2</p> </div>
  <div id="item3" class=""> <p>Item 3</p> </div>
  <div id="item4" class=""> <p>Item 4</p> </div>
  <div id="item5" class=""> <p>Item 5</p> </div>
  <div id="item6" class=""> <p>Item 6</p> </div>
</div>

main.css

.container {
  display: grid;
}

Placing Grid Lines

Fixed-Width Grid Tracks

.container {
  grid-template-columns: 200px 50% 10em;
  grid-template-rows: 100px 200px;
}

Flexible Grid Tracks

You can divide up the space into fractional units using fr.

grid-template-columns: 1fr 2fr 3fr;

Content-Aware Tracks

You can make the grid cell fit the contents of the grid item using min-content and max-content.

grid-template-columns: 1fr max-content 3fr;

Grid Areas

grid-template-areas:
  "header1 header2 header3"
  "content1 content2 content3"
  "footer1 footer2 footer3";

Attaching Elements to the Grid

Using Grid Lines

#item3 {
  grid-column-start: 1;
  grid-column-end: 2;
  grid-row-start: 1;
  grid-row-end: 2;
}

#item3 {
  grid-column-start: 1;
  grid-column-end: span;
}

Using Named Grid Lines

.container {
  grid-template-columns: [one] 1fr [two] 3fr [biff] 2fr [stop-me];
}

#item3 {
  grid-column-start: one;
  grid-column-end: biff;
}

Short hand

#item3 {
  grid-column: one / biff;
  grid-row: 1 / 3;
}

Using Areas

#item1 {
  grid-area: footer2;
}

#item2 {
  grid-area: header3;
}

#item5 {
  grid-area: header1;
}

An item can cover more than one area using multiple areas.

#item5 {
  grid-area: header1 / header1 / content1 / header2;
}

You can set an area to cover more than one grid cell.

grid-template-areas:
  "header1 header1 header3"
  "content1 content2 content3"
  "footer1 footer2 footer3";

#item5 {
  grid-area: header1;
}

.container {
  grid-template-areas:
    "header1 header1 header3"
    "content1 content2 rightside"
    "footer1 footer2 rightside";
}

#item3 {
  grid-area: rightside;
}

Grid Item Overlap

#item5 {
  grid-area: header1 / header1 / content1 / header3;
}

You can use z-index to order overlapping grid items. Elements with a higher z-index will be placed on top of elements with lower z-index values.

#item2 {
  grid-area: header3;
  z-index: 2;
}

#item3 {
  grid-area: rightside;
  z-index: 2;
}

#item5 {
  grid-area: header1 / header1 / content1 / header3;
  z-index: 0;
}

Grid Spaces

A gutter, or gap, is the space between two grid tracks. You can set the gutter size in the grid container.

.container {
  grid-row-gap: 20px;
  grid-column-gap: 5em;
  grid-gap: 10px;
}

Alignment

Grid items can be aligned both horizontally and vertically. Horizontal alignment is done with the justify-* properties and vertically with the align-* properties.

Aligning a Grid Item

justify-self: [ start | left | center | end | right | stretch ]
align-self: [ start | left | center | end | right | stretch ]

#item1 {
  justify-self: start;
  align-self: end;
}

#item2 {
  justify-self: center;
  align-self: center;
}

#item4 {
  justify-self: stretch;
  align-self: stretch;
}

Aligning All Items

justify-items: [ start | left | center | end | right | stretch ]
align-items: [ start | left | center | end | right | stretch ]

.container {
  justify-items: center;
  align-items: end;
}

Aligning the Entire Grid

You can justify or align the entire grid. This may override any gap values you've set.

justify-content: [ start | left | center | end | right | space-between | space-around | space-evenly ]
align-content: [ start | left | center | end | right | space-between | space-around | space-evenly ]

.container {
  grid-template-columns: 100px 300px 200px;
  justify-content: center;

  grid-template-rows: 120px 40px 60px;
  min-height: 400px;
  align-content: center;
}

Resources

CSS-TRICKS A Complete Guide to Grid

Learn CSS Grid

Grid Garden (A game for learning grid)

CSS Grid Changes EVERYTHING (YouTube)

"Grid Layout in CSS: Interface Layout for the Web" by Eric A. Meyer