Redesigning a Site to Use CSS Grid Layout

CSS Grid is a new hot trend in web development these days. Forget about table layouts and floats: a new way to design websites is already here! This technology introduces two-dimensional grids which define multiple areas of layout with a handful of CSS rules. Grid can make third-party frameworks such as 960gs or Bootstrap grid redundant, as you may easily do everything yourself! This feature is supported by all major browsers, though Internet Explorer implements an older version of the specification.

In this article we are going to see CSS Grid in action by creating a responsive multi-column website layout.

What We Are Going to Build

So, we were asked to create a typical website layout with a header, main content area, sidebar to the right, a list of sponsors, and a footer:

Another developer has already tried to solve this task and came up with a solution that involves floats, display: table, and some clearfix hacks. We are going to refer to this existing layout as "initial".

Until recently, floats were considered to be the best option to create such layouts. Prior to that, we had to utilize HTML tables but they had a number of downsides. Specifically, such table layout is very rigid, it requires lots of tags (table, tr, td, th etc), and semantically these tags are used to present table data, not to design layouts.

But CSS continues to evolve, and now we have CSS Grid. Conceptually it is similar to an old table layout but can use semantic HTML elements with a more flexible layout.

Planning The Grid

First things first: we need to define a basic HTML structure for our document. Before that, let's briefly talk about how the initial example works. It has the following main blocks:

• .container is the global wrapper that has small margins to the left and to the right.
• .main-header is the header that contains the .logo (occupies 20% of space, floats to the left) and the .main-menu (occupies 79% of space, floats to the right). The header is also assigned with a hacky fix to clear the floats.
• .content-area-wrapper wraps the main .content-area (occupies 66.6% of space minus 1rem reserved for margin, floats to the left) and the .sidebar (occupies 33.3% of the space, floats to the right). The wrapper itself is also assigned with a clearfix.
• .sponsors-wrapper contains the logos of the sponsors. Inside, there is a .sponsors section with the display property set to table. Each sponsor, in turn, is displayed as a table cell.
• .footer is our footer and spans to 100% of space.

Our new layout will be very similar to the initial one, but with one exception: we won't add the .main-header and .content-area-wrapper wrappers because the clearfixes won't be required anymore. Here is the new version of the HTML:

Note that you may utilize the body as the global .container — that's just a matter of preference in this case. All in all, we have six main areas:

1. Logo
2. Menu
3. Main content
4. Sidebar
5. Sponsors
6. Footer

Usually it is recommended to to implement mobile-first approach: that is, start from the mobile layout and then designing for larger screens. This is not necessary in this case because we are adapting an initial layout which already falls back to a linearized view on small-screen devices. Therefore, let's start by focusing on the grid's implementation, and after that talk about responsiveness and fallback rules. So, return to our scheme and see how the grid columns can be arranged:

So, I propose having three columns (highlighted with red color) and four rows (highlighted with blue). Some areas, like logo, are going to occupy only one column, whereas others, like main content, are going to span multiple columns. Later we can easily modify the layout, move the areas around, or add new ones.

Following the scheme, give each area a unique name. These will be used in the layout defined below:

Now set the display property to grid, define three columns and add small margins to the left and right of the main container:

display: grid defines a grid container and sets a special formatting context for its children. fr is a special unit that means "fraction of the free space of the grid container". 2 + 6 + 4 gives us 12, and 6 / 12 = 0.5. It means that the middle column is going to occupy 50% of the free space.

I would also like to add some spacing between the rows and columns:

Having done this we can work with individual areas. But before wrapping up this section let's quickly add some common styles:

Good! Now we can proceed to the first target which is going to be the header.

Designing the Header

Our header occupies the first row that should have a specific height set to 3rem. In the initial layout this is solved by assigning the height property for the header wrapper:

Also note that the logo and the menu are vertically aligned to the middle which is achieved using the line-height trick:

With CSS Grid, however, things are going to be simpler: we won't require any CSS hacks.

Start by defining the first row:

Our logo should occupy only one column, whereas the menu should span two columns. We can express our intent with the help of grid-template-areas property which references the grid-area names assigned above:

What is going on here? Well, by saying logo only once we are making sure that it occupies only one, the left-most column. menu menu means that the menu occupies two columns: the middle and the right-most one. See how straightforward this rule is!

Now align the logo on the Y axis:

The menu should be centered vertically and pulled to the right:

Our menu is built with the ul and li tags, so let's also style them a bit by removing markers, nullifying margins/paddings, and setting turning the menu to a flex container:

That's pretty much it. To observe the result, I am going to use Firefox browser with a handy CSS Grid highlighter tool enabled (there are similar tools for other browsers available: for instance, Gridman for Chrome). To gain access to this tool, press F12 and select the .container element which should have a grid label:

After that, proceed to the CSS rules tab, and find the display: grid property. By pressing on the small icon next to the grid value you may enable or disable the highlighter:

Here is the result:

Highlighter displays all your rows and columns, as well as the margins between them and the areas' names. You may customize the output inside the Layout section which also lists all the grids on the page:

So, we've dealt with the header, therefore let's proceed to the main content area and the sidebar.

Main Content and Sidebar

Our main content area should span two columns, whereas the sidebar should occupy only one. As for the row, I would like its height to be set automatically. We can update the .container grid accordingly:

I'd like to add some padding for the sidebar to give it some more visual space:

Here is the result as viewed in Firefox's Grid tool:

Sponsors

The sponsors section should contain five items with equal widths and heights. Each item, in turn, will have one image.

In the initial layout this block is styled with display: table property, but we won't rely on it. Actually, the sponsors section may be great candidate for applying CSS grid as well!

First of all, tweak the grid-template-areas to include the sponsors area:

Now turn the .sponsors section to a grid as well:

As long as we need five items with equal widths, a repeat function can be utilized to define the columns:

As for the row, its height should be set automatically. The gap between the columns should be equal to 1rem:

Style each item:

Here is the intermediate result:

This example illustrates that you may safely nested grids, and this will work without any problems. Another solution might be using Flexbox, but in this case the sponsors may wrap if there is not enough width for them.

Now I would like to center the images both vertically and horizontally. We might try doing the following:

place-self aligns the element on X and Y axises. It is a shorthand property to align-self and justify-self.

The images will indeed be aligned but unfortunately the white background is gone. This is because each .sponsor now has width and height equal to the image's dimensions:

It means that we need a different approach here, and one of the possible solutions is to employ Flexbox:

Now everything is displayed properly, and now we know that Grid plays nicely with Flexbox:

Footer

Our last section is footer, and it is actually the simplest section. All we have to do is span it to all three columns:

Basically, the layout is finished! However, we are not done yet: the site also has to be responsive. So, let's take care of this task in the next section.

Making the Layout Responsive

Having CSS Grid in place, it is actually very easy to introduce responsiveness, because we can quickly reposition the areas.

Large Screens

Let's start with large screens (in this article I'll be sticking to the same breakpoints as defined in Bootstrap 4). I would like to decrease horizontal margin of the main container and the gap between individual sponsors:

Medium Screens

On the medium screens, I would like the main content area and the sidebar to occupy all three columns:

Let's also decrease font size and stack the sponsors so they are displayed one beneath another. The gap between the columns should be zero (because actually there will be only one column). Instead, I'll set a gap between the rows:

This is how the site looks on medium screens now:

Small Screens

On small screens we are going to display each area on a separate row, which means that there will be only one column now:

The menu should not be pulled to the right in this case, and we also don't need the gap between the columns:

The job is done:

Note that you may even rearrange the grid items easily for various screens. Suppose we would like to put the menu to the bottom on small screens (so that the visitors do not have to scroll up after they've finished reading material on the page). To do that, simply tweak the grid-template-areas:

Without Media Queries?..

It is worth mentioning that we can make the sponsors block responsive without any media queries at all. This is possible with the help of auto-fit property and minmax function. To see them in action, tweak the styles for the .sponsors like this:

repeat function, as you already know, repeats the columns as many times as necessary.

auto-fill means "fill the row with as many columns as possible". If there is not enough space for the column, it will be placed to the next line.

minmax allows us to specify the minimum and maximum value for the columns' widths. In this case each column should span 1 fraction of free space, but no less than 200 pixels.

Al this means that on smaller screens the columns may be shrinked down to at most 200px each. If there is still not enough space, one or multiple columns will be placed to a separate line. Here is the result of applying the above CSS rules:

Fallbacks

Unfortunately, CSS Grid is not yet fully supported by all browsers, and you may guess which one is still implementing an older version of the specification. Yeah, it's Internet Explorer 10 and 11. If you open the demo in this browser, you'll see that the grid does not work at all, and the areas are simply stacked:

Of course, this is not the end of the world, as the site is still usable, but let's add at least some fallback rules. The good news is that if the element is floated and also has grid assigned, then the grid takes precedence. Also, the display, vertical-align, and some other properties also have no effect on grid items, so let's take advantage of that fact.

The stacked menu looks nice as is, but the sidebar should be probably placed next to the main content, not below it. We can achieve this by using display: inline-block:

In all browsers that support grid, these properties will have no effect, but in IE they'll be applied as expected. One more property we need to tweak is the width:

But having added these styles, our grid layout will now look much worse, because the width property is not ignored by grid items. This can be fixed with the help of @supports CSS query. IE does not understand these queries, but this is not needed anyways: we'll use it to fix the grid!

Now let's take care of the sponsor items and add some top margin for each block:

We don't need any top margin when the grid is supported, so nullify it inside the @supports query:

Lastly, let's add some responsiveness for IE. We'll simply stretch main content, sidebar, and each sponsor to full width on smaller screens:

Don't forget to fix the sponsor's width for the browsers that support grid:

Here is how the site looks in Internet Explorer now:

Conclusion

In this article we have seen CSS Grid in action and utilized it to redesign an existing float-based layout. Comparing these two solutions, we can see that the HTML and CSS code of the "grid" solution is smaller (not counting the fallbacks, of course), simpler and more expressive. With the help of the grid-template-areas property it is easy to understand how individual areas are laid out, and we may quickly reposition them or adjust their sizes. On top of that, we don't need to rely on various hacky tricks (like clearfix, for instance).

So, as you see, CSS Grid is a great alternative to floats, and it is production-ready. You may need to provide some fallback rules for Internet Explorer (that implements an older version of the specification), but as you see they are not very complex and in general the site is still usable even without any backwards compatibility at all.