A Complete Guide to Grid

display

Defines the element as a grid container and establishes a new grid formatting context for its contents.

Values:

• grid - generates a block-level grid
• inline-grid - generates an inline-level grid

.container {
  display: grid | inline-grid;
}

Note: The ability to pass grid parameters down through nested elements (aka subgrids) has been moved to level 2 of the CSS Grid specification.

grid-template-columns
grid-template-rows

Defines the columns and rows of the grid with a space-separated list of values. The values represent the track size, and the space between them represents the grid line.

Values:

• <track-size> - can be a length, a percentage, or a fraction of the free space in the grid (using the fr unit)
• <line-name> - an arbitrary name of your choosing

.container {
  grid-template-columns: <track-size> ... | <line-name> <track-size> ...;
  grid-template-rows: <track-size> ... | <line-name> <track-size> ...;
}

Examples:

When you leave an empty space between the track values, the grid lines are automatically assigned numerical names:

.container {
  grid-template-columns: 40px 50px auto 50px 40px;
  grid-template-rows: 25% 100px auto;
}

But you can choose to explicitly name the lines. Note the bracket syntax for the line names:

.container {
  grid-template-columns: [first] 40px [line2] 50px [line3] auto [col4-start] 50px [five] 40px [end];
  grid-template-rows: [row1-start] 25% [row1-end] 100px [third-line] auto [last-line];
}

Note that a line can have more than one name. For example, here the second line will have two names: row1-end and row2-start:

.container {
  grid-template-rows: [row1-start] 25% [row1-end row2-start] 25% [row2-end];
}

If your definition contains repeating parts, you can use the repeat() notation to streamline things:

.container {
  grid-template-columns: repeat(3, 20px [col-start]) 5%;
}

Which is equivalent to this:

.container {
  grid-template-columns: 20px [col-start] 20px [col-start] 20px [col-start] 5%;
}

The fr unit allows you to set the size of a track as a fraction of the free space of the grid container. For example, this will set each item to one third the width of the grid container:

.container {
  grid-template-columns: 1fr 1fr 1fr;
}

The free space is calculated after any non-flexible items. In this example the total amount of free space available to the fr units doesn't include the 50px:

.container {
  grid-template-columns: 1fr 50px 1fr 1fr;
}

grid-template-areas

Defines a grid template by referencing the names of the grid areas which are specified with the grid-area property. Repeating the name of a grid area causes the content to span those cells. A period signifies an empty cell. The syntax itself provides a visualization of the structure of the grid.

Values:

• <grid-area-name> - the name of a grid area specified with grid-area
• . - a period signifies an empty grid cell
• none - no grid areas are defined

.container {
  grid-template-areas: 
    "<grid-area-name> | . | none | ..."
    "...";
}

Example:

.item-a {
  grid-area: header;
}
.item-b {
  grid-area: main;
}
.item-c {
  grid-area: sidebar;
}
.item-d {
  grid-area: footer;
}

.container {
  grid-template-columns: 50px 50px 50px 50px;
  grid-template-rows: auto;
  grid-template-areas: 
    "header header header header"
    "main main . sidebar"
    "footer footer footer footer";
}

That'll create a grid that's four columns wide by three rows tall. The entire top row will be comprised of the header area. The middle row will be comprised of two main areas, one empty cell, and one sidebar area. The last row is all footer.

Each row in your declaration needs to have the same number of cells.

You can use any number of adjacent periods to declare a single empty cell. As long as the periods have no spaces between them they represent a single cell.

Notice that you're not naming lines with this syntax, just areas. When you use this syntax the lines on either end of the areas are actually getting named automatically. If the name of your grid area is foo, the name of the area's starting row line and starting column line will be foo-start, and the name of its last row line and last column line will be foo-end. This means that some lines might have multiple names, such as the far left line in the above example, which will have three names: header-start, main-start, and footer-start.

grid-template

A shorthand for setting grid-template-rows, grid-template-columns, and grid-template-areas in a single declaration.

Values:

• none - sets all three properties to their initial values
• subgrid - sets grid-template-rows and grid-template-columns to subgrid, and grid-template-areas to its initial value
• <grid-template-rows> / <grid-template-columns> - sets grid-template-columns and grid-template-rows to the specified values, respectively, and sets grid-template-areas to none

.container {
  grid-template: none | subgrid | <grid-template-rows> / <grid-template-columns>;
}

It also accepts a more complex but quite handy syntax for specifying all three. Here's an example:

.container {
  grid-template:
    [row1-start] "header header header" 25px [row1-end]
    [row2-start] "footer footer footer" 25px [row2-end]
    / auto 50px auto;
}

That's equivalent to this:

.container {
  grid-template-rows: [row1-start] 25px [row1-end row2-start] 25px [row2-end];
  grid-template-columns: auto 50px auto;
  grid-template-areas: 
    "header header header" 
    "footer footer footer";
}

Since grid-template doesn't reset the implicit grid properties (grid-auto-columns, grid-auto-rows, and grid-auto-flow), which is probably what you want to do in most cases, it's recommended to use the grid property instead of grid-template.

grid-column-gap
grid-row-gap

Specifies the size of the grid lines. You can think of it like setting the width of the gutters between the columns/rows.

Values:

• <line-size> - a length value

.container {
  grid-column-gap: <line-size>;
  grid-row-gap: <line-size>;
}

Example:

.container {
  grid-template-columns: 100px 50px 100px;
  grid-template-rows: 80px auto 80px; 
  grid-column-gap: 10px;
  grid-row-gap: 15px;
}

The gutters are only created between the columns/rows, not on the outer edges.

grid-gap

A shorthand for grid-row-gap and grid-column-gap

Values:

• <grid-row-gap> <grid-column-gap> - length values

.container {
  grid-gap: <grid-row-gap> <grid-column-gap>;
}

Example:

.container {
  grid-template-columns: 100px 50px 100px;
  grid-template-rows: 80px auto 80px; 
  grid-gap: 10px 15px;
}

If no grid-row-gap is specified, it's set to the same value as grid-column-gap

justify-items

Aligns the content inside a grid item along the row axis (as opposed to align-items which aligns along the column axis). This value applies to all grid items inside the container.

Values:

• start - aligns the content to the left end of the grid area
• end - aligns the content to the right end of the grid area
• center - aligns the content in the center of the grid area
• stretch - fills the whole width of the grid area (this is the default)

.container {
  justify-items: start | end | center | stretch;
}

Examples:

.container {
  justify-items: start;
}

.container{
  justify-items: end;
}

.container {
  justify-items: center;
}

.container {
  justify-items: stretch;
}

This behavior can also be set on individual grid items via the justify-self property.

align-items

Aligns the content inside a grid item along the column axis (as opposed to justify-items which aligns along the row axis). This value applies to all grid items inside the container.

Values:

• start - aligns the content to the top of the grid area
• end - aligns the content to the bottom of the grid area
• center - aligns the content in the center of the grid area
• stretch - fills the whole height of the grid area (this is the default)

.container {
  align-items: start | end | center | stretch;
}

Examples:

.container {
  align-items: start;
}

.container {
  align-items: end;
}

.container {
  align-items: center;
}

.container {
  align-items: stretch;
}

This behavior can also be set on individual grid items via the align-self property.

justify-content

Sometimes the total size of your grid might be less than the size of its grid container. This could happen if all of your grid items are sized with non-flexible units like px. In this case you can set the alignment of the grid within the grid container. This property aligns the grid along the row axis (as opposed to align-content which aligns the grid along the column axis).

Values:

• start - aligns the grid to the left end of the grid container
• end - aligns the grid to the right end of the grid container
• center - aligns the grid in the center of the grid container
• stretch - resizes the grid items to allow the grid to fill the full width of the grid container
• space-around - places an even amount of space between each grid item, with half-sized spaces on the far ends
• space-between - places an even amount of space between each grid item, with no space at the far ends
• space-evenly - places an even amount of space between each grid item, including the far ends

.container {
  justify-content: start | end | center | stretch | space-around | space-between | space-evenly;	
}

Examples:

.container {
  justify-content: start;
}

.container {
  justify-content: end;	
}

.container {
  justify-content: center;	
}

.container {
  justify-content: stretch;	
}

.container {
  justify-content: space-around;	
}

.container {
  justify-content: space-between;	
}

.container {
  justify-content: space-evenly;	
}

align-content

Sometimes the total size of your grid might be less than the size of its grid container. This could happen if all of your grid items are sized with non-flexible units like px. In this case you can set the alignment of the grid within the grid container. This property aligns the grid along the column axis (as opposed to justify-content which aligns the grid along the row axis).

Values:

• start - aligns the grid to the top of the grid container
• end - aligns the grid to the bottom of the grid container
• center - aligns the grid in the center of the grid container
• stretch - resizes the grid items to allow the grid to fill the full height of the grid container
• space-around - places an even amount of space between each grid item, with half-sized spaces on the far ends
• space-between - places an even amount of space between each grid item, with no space at the far ends
• space-evenly - places an even amount of space between each grid item, including the far ends

.container {
  align-content: start | end | center | stretch | space-around | space-between | space-evenly;	
}

Examples:

.container {
  align-content: start;	
}

.container {
  align-content: end;	
}

.container {
  align-content: center;	
}

.container {
  align-content: stretch;	
}

.container {
  align-content: space-around;	
}

.container {
  align-content: space-between;	
}

.container {
  align-content: space-evenly;	
}

grid-auto-columns
grid-auto-rows

Specifies the size of any auto-generated grid tracks (aka implicit grid tracks). Implicit grid tracks get created when you explicitly position rows or columns (via grid-template-rows/grid-template-columns) that are out of range of the defined grid.

Values:

• <track-size> - can be a length, a percentage, or a fraction of the free space in the grid (using the fr unit)

.container {
  grid-auto-columns: <track-size> ...;
  grid-auto-rows: <track-size> ...;
}

To illustrate how implicit grid tracks get created, think about this:

.container {
  grid-template-columns: 60px 60px;
  grid-template-rows: 90px 90px
}

This creates a 2 x 2 grid.

But now imagine you use grid-column and grid-row to position your grid items like this:

.item-a {
  grid-column: 1 / 2;
  grid-row: 2 / 3;
}
.item-b {
  grid-column: 5 / 6;
  grid-row: 2 / 3;
}

We told .item-b to start on column line 5 and end at column line 6, but we never defined a column line 5 or 6. Because we referenced lines that don't exist, implicit tracks with widths of 0 are created to fill in the gaps. We can use grid-auto-columns and grid-auto-rows to specify the widths of these implicit tracks:

.container {
  grid-auto-columns: 60px;
}

grid-auto-flow

If you have grid items that you don't explicitly place on the grid, the auto-placement algorithm kicks in to automatically place the items. This property controls how the auto-placement algorithm works.

Values:

• row - tells the auto-placement algorithm to fill in each row in turn, adding new rows as necessary
• column - tells the auto-placement algorithm to fill in each column in turn, adding new columns as necessary
• dense - tells the auto-placement algorithm to attempt to fill in holes earlier in the grid if smaller items come up later

.container {
  grid-auto-flow: row | column | row dense | column dense
}

Note that dense might cause your items to appear out of order.

Examples:

Consider this HTML:

<section class="container">
  <div class="item-a">item-a</div>
  <div class="item-b">item-b</div>
  <div class="item-c">item-c</div>
  <div class="item-d">item-d</div>
  <div class="item-e">item-e</div>
</section>

You define a grid with five columns and two rows, and set grid-auto-flow to row (which is also the default):

.container {
  display: grid;
  grid-template-columns: 60px 60px 60px 60px 60px;
  grid-template-rows: 30px 30px;
  grid-auto-flow: row;
}

When placing the items on the grid, you only specify spots for two of them:

.item-a {
  grid-column: 1;
  grid-row: 1 / 3;
}
.item-e {
  grid-column: 5;
  grid-row: 1 / 3;
}

Because we set grid-auto-flow to row, our grid will look like this. Notice how the three items we didn't place (item-b, item-c and item-d) flow across the available rows:

If we instead set grid-auto-flow to column, item-b, item-c and item-d flow down the columns:

.container {
  display: grid;
  grid-template-columns: 60px 60px 60px 60px 60px;
  grid-template-rows: 30px 30px;
  grid-auto-flow: column;
}

grid

A shorthand for setting all of the following properties in a single declaration: grid-template-rows, grid-template-columns, grid-template-areas, grid-auto-rows, grid-auto-columns, and grid-auto-flow. It also sets grid-column-gap and grid-row-gap to their initial values, even though they can't be explicitly set by this property.

Values:

• none - sets all sub-properties to their initial values
• <grid-template-rows> / <grid-template-columns> - sets grid-template-rows and grid-template-columns to the specified values, respectively, and all other sub-properties to their initial values
• <grid-auto-flow> [<grid-auto-rows> [ / <grid-auto-columns>] ] - accepts all the same values as grid-auto-flow, grid-auto-rows and grid-auto-columns, respectively. If grid-auto-columns is omitted, it is set to the value specified for grid-auto-rows. If both are omitted, they are set to their initial values

.container {
    grid: none | <grid-template-rows> / <grid-template-columns> | <grid-auto-flow> [<grid-auto-rows> [/ <grid-auto-columns>]];
}

Examples:

The following two code blocks are equivalent:

.container {
  grid: 200px auto / 1fr auto 1fr;
}

.container {
  grid-template-rows: 200px auto;
  grid-template-columns: 1fr auto 1fr;
  grid-template-areas: none;
}

And the following two code blocks are equivalent:

.container {
  grid: column 1fr / auto;
}

.container {
  grid-auto-flow: column;
  grid-auto-rows: 1fr;
  grid-auto-columns: auto;
}