Solved By Modern CSS: Feature Image

Introduction

When I redesigned my website, I needed a way to have the feature image play nicely regardless of where it’s placed or the viewport/container size.

This is the design I aim to implement:

I have an image and a caption. On small sizes, the caption is displayed in a classic style. If the container is large enough, I want to rotate the image and show the caption in a circular style, positioned at the bottom-right corner.

How we can build that in CSS?

Before container queries, we could have built it like this:

.figure {
  figcaption {
    /* Classic style. */
  }

  @media (min-width: 600px) {
    figcaption {
      position: absolute;
      right: 0;
      bottom: 0;
      /* CSS needed to make the caption in a circular style. */
    }
  }
}

Here is a demo:

Logo

Welcome to my blog.

This is a caption of the image.

When the content wraps to a new line, there is enough space for the figure, but the figure stays with the classic look. Can we do better?

Using container queries

Here is the same demo but with container queries instead. I highlighted four different viewport sizes so you can understand the value of using CSS container queries.

Click on the next button and see what the component looks like on different viewport sizes.

Small view, classic style.

Container width > 250px

Logo

Welcome to my blog.

This is a caption of the image.

The component layout is alternating between the stacked and the circular design. This wouldn’t happen so smoothly without container queries.

If we use media queries for this, the CSS will look something like this:

figure {
  /* Stacked style */

  @media (min-width: 400px) {
    /* Circular style */
  }

  @media (min-width: 900px) {
    /* Stacked style */
  }

  @media (min-width: 1100px) {
    /* Circular style */
  }
}

Not to mention that this can easily fail if we change the design or content.

Let’s explore how to build that.

Building the component

Wrapping the component in an additional element

For containment to work, it’s important to wrap the component in a container, and then query the component according to that container. Otherwise, it will not work and it will cause an infinite loop (It will keep querying itself).

<div class="figure-wrapper">
  <figure>
    <img src="images/thumb.jpg" alt="" />
    <figcaption></figcaption>
  </figure>
</div>

Then, we need to define the figure-wrapper as a container.

.figure-wrapper {
  container-type: inline-size;
  container-name: thumbWrapper;
}

Let’s test the above out to ensure it’s working as expected. If the container is greater than 240px, add an outline to the <figure> element.

@container thumbWrapper (min-width: 240px) {
  figure {
    outline: dashed 2px deeppink;
    outline-offset: 2px;
  }
}

Try to resize the browser in the demo below and see how the outline appears if the width is 240px or more.

Container width > 250px

Logo

Welcome to my blog.

This is a caption of the image.

Conditional CSS with :has

By default, the design is in the stacked version. If the container width is large enough, we’ll switch to the circular style.

We need to check if the figure has a <figcaption>. If yes, we need to: rotate the image.

To build that, we can use CSS :has() selector to check if there is a <figcaption> or not. I wrote an interactive guide about CSS :has in case you are interested.

figure {
  @container thumbWrapper (min-width: 250px) {
    &:has(figcaption) {
      /* Rotate the image */
      img {
        transform: rotate(1.25deg);
      }
    }
  }
}

Now that the basic CSS is here, let’s move to the layout.

Building the layout

Even though it’s a simple design, there are a couple of ways to build it, and they’re worth considering.

Option 1: Absolute positioning for everything

In this option, the concept is to position both the image and the caption out of the document flow.

figure {
  @container thumbWrapper (min-width:240px) {
    position: relative;

    img {
      position: absolute;
      left: 0;
      top: 0;
      width: 90%;
    }
  }
}

While the styles are applied to the image, the container height is (almost) zero due to not having any element in the normal flow.

See what the outline looks like below:

Logo

Welcome to my blog.

This is a caption of the image.

To fix that, we need to define a size for the <figure> itself, and then pass that to the image.

figure {
  @container thumbWrapper (min-width:240px) {
    position: relative;
    aspect-ratio: 4/3;
    width: 100%;

    img {
      position: absolute;
      left: 0;
      top: 0;
      /* Limit the width of the image to 85% of the container. */
      width: 85%;
    }

    .caption.caption {
      right: 0;
      bottom: 0;
    }
  }
}

It works, but for me, it’s not optimal, or not the solution that I can be happy about:

Too much position: absolute. I try to minimize its usage wherever possible.
I don’t like limiting the image size and defining a width in percentages (otherwise a fixed width in pixels won’t work for larger containers)

Logo

Welcome to my blog.

This is a caption of the image.

Option 2: CSS grid overlapping

In this solution, I need to use CSS grid to overlap both the image and caption. Let’s explore it.

In CSS grid, we can overlap items by placing them on the same column and row.

figure {
  display: grid;

  > * {
    grid-area: 1 / -1;
  }
}

Here is the result:

Logo

Welcome to my blog.

This is a caption of the image.

Next, we need to make the image size as per the design needed. To do that, we can subtract half of the caption size.

figure {
  img {
    max-width: calc(100% - var(--caption-size) / 3);
    max-height: calc(100% - var(--caption-size) / 3);
  }
}

Here is the result:

Logo

Welcome to my blog.

This is a caption of the image.

I like this solution and don’t see any issues in using it. You can read my interactive guide on CSS grid area to learn more.

Option 3: Padding on the figure

In this solution, only the caption will have position: absolute, and we’ll add padding on the right and bottom sides to push the image a bit.

Logo

Welcome to my blog.

This is a caption of the image.

To mimic the effect of the image intersecting with the caption, I added padding on the bottom and right sides of the figure container.

figure {
  @container thumbWrapper (min-width:240px) {
    position: relative;
    padding-inline-end: calc(var(--caption-size) / 3);
    padding-bottom: calc(var(--caption-size) / 3);

    figcaption {
      position: absolute;
      right: 0;
      bottom: 0;
    }
  }
}

In my blog, I used this solution as I liked it the most. However, that doesn’t mean that the grid overlapping isn’t good. Both are fine to me.

Making it fluid

To make it even better, we can use fluid CSS to make the component work on any container or screen size. We can define fluid CSS on the following:

Border radius
Font size
Caption size
Padding

Thanks to container query units, we can achieve fluid sizing based on the container width.

In our case, I will use the unit cqw which stands for “container query width”.

figure {
  /* The size of figcaption */
  --caption-size: clamp(6rem, 4.167rem + 13.33cqw, 10rem);

  img {
    border-radius: clamp(0.625rem, -0.625rem + 10cqw, 1.875rem);
  }

  @container thumbWrapper (min-width:240px) {
    padding-inline-end: calc(var(--caption-size) / 4 + 8cqw);
    padding-bottom: calc(var(--caption-size) / 4 + 8cqw);

    figcaption {
      width: var(--caption-size);
      height: var(--caption-size);
      font-size: clamp(0.813rem, 0.727rem + 0.63cqw, 1rem);
    }
  }
}

In the following demo, try to resize and notice how the border radius, font size, padding, and caption size are fluid.

Container width > 250px

Logo

Welcome to my blog.

This is a caption of the image.

Putting it under pressure

In this interactive example, my goal is to put the component to use within different contexts and scenarios to make sure it’s working well.

I explored the following scenarios:

Default: two columns section
Let the component take the full-width
3-cols grid
2-cols grid, with the first item spanning 66%
Mobile size

Change the options below to see it in action.

Conclusion

As you have seen, this might seem like a fairly simple component. When considering it in multiple contexts, additional challenges arise. I enjoyed building it and using modern CSS to build it out. I hope you learned something new!

Debugging CSS book

I wrote a book that will help you improve your debugging CSS skills and reduce the time you spend on bugs by showing proven methods and techniques.

This year, I have reduced the book price to just $19.99. Get your copy and enhance your debugging CSS skills now.

Solved By Modern CSS: Feature Image

Table of contents

Introduction

Using container queries

Building the component

Wrapping the component in an additional element

Conditional CSS with :has

Building the layout

Option 1: Absolute positioning for everything

Option 2: CSS grid overlapping

Option 3: Padding on the figure

Making it fluid

Putting it under pressure

Conclusion

Debugging CSS book

Join my mailing list