The problem

Have you ever removed a flexbox from a container or wrapped some elements in a new container just to have more control over the spacing between the items? You are not alone.

When I use flexbox or grid gap, I sometimes wonder if I can control the gap between some elements.

Consider the following example:

<div class="card">
  <img src="thumb.jpg" alt="" />
  <div class="cardContent">
    <h3>Title</h3>
    <p>Description</p>
    <p><a href="#">Link</a></p>
  </div>
</div>

.card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

This will add vertical spacing between the flex items.

If I need to reduce the space between the title and description, what are the options that I have?

• Adjust the vertical margin of the title or description.
• Wrap title and description in a new container and re-apply flexbox with a smaller spacing.
• Use the default flow layout with margins.

Current options to change the gap between items

Adjust the vertical margin

I tried adjusting the margin first.

.card-description {
  margin-top: calc(var(--space) / 2 * -1);
}

Here is a working demo with the result. Play with the spacer opacity to get a feel of the spacing.

While that works, it comes with a few issues.

Removing an element from the card

Let’s assume that we want to remove the title, maybe we need to use this card in a place where a title is not needed.

Since the space is added to the description, it will still be there. In that case, we need to remove it.

.card--without-title .card-description {
  margin-top: 0;
}

It works, but it feels hacky.

Wrap in a new container

First, we need to wrap the title and description in a new container.

<div class="card">
  <img src="thumb.jpg" alt="" />
  <div class="card-content">
    <div class="card-item">
      <h3>Title</h3>
      <p>Description</p>
    </div>
    <p><a href="#">Link</a></p>
  </div>
</div>

Then, we need to apply flexbox on the new container with flex-direction: column and set the space we need with gap.

.card-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

Here is the result:

While that works and it sounds less hacky than the first option, the biggest drawback is that we need to change the HTML.

Can we do better?

Using the flow layout

We can use the flow layout (default one) and use margins with CSS variables. A few years ago, I learned about the flow utility from Andy Bell. I use it in almost all of my projects.

The idea is to use the universal CSS selector to select sibling elements and add margins to each.

.u-flow {
  > * + * {
    margin-top: var(--space);
  }
}

The above CSS will add a margin-top to all elements between the first and last child. In our example, we can do this:

.card {
  --space: 12px;
}

.card-content {
  > * + * {
    margin-top: var(--space);
  }
}

Then, we can override the space variable on per element basis.

.card-description {
  --space: 4px;
}

Here is the result:

To me, this is the best option for now:

• It works without weird hacks
• We can remove an item and the spacing will work just fine
• No need to edit the HTML

My proposal

This got me to think about having a native way to do this with CSS gap. Since the gap property is added to the container, we need a way to allow the flex or grid items to have a custom gap.

<div class="card">
  <img src="thumb.jpg" alt="" />
  <div class="card-content">
    <h3>Title</h3>
    <p>Description</p>
    <p><a href="#">Link</a></p>
  </div>
</div>

I didn’t think deeply about the naming, but I reused a similar naming convention in CSS from align-self.

Here, I used CSS scope to scope the selection between two HTML elements. This isn’t valid in the browser as per my testing.

.card-content {
  @scope (h3) to (p) {
    gap-self: 4px;
  }
}

Or maybe something like this:

.card-content {
  p {
    gap-above: 4px;
  }
}

What do you think?