Results Summary

Thank you for helping however I mean:

How do you set the border on the box's corners, not the whole border? @KirativeWD

@fayiz770

Oooh, I see what you're asking now. The corner borders are so difficult to see; I didn't include them myself (lol).

This could be accomplished in a few ways, the easiest being with <div> elements that are absolutely positioned. However, this would require a lot more HTML and CSS so let's go with a solution I found on css-tip that I adapted for this solution and requires far less code.

For visual purposes, I adapted my GitHub repo (without the borders, though I may add them) to a CodePen with the borders. You can see it here: Frontend Mentor - Results Summary with Corner Borders

Depending on your layout, you may have to adapt what I have done, but first, we will look at the rendered HTML structure.

<li style="outline: 1px solid hsl(0, 30%, 90%);">
  <div class="inner" style="background: rgba(255, 87, 87, 0.1);">
    <div>
      <img>
      <h4>Reaction</h4>
    </div>
    <div>
      <span>
        <span>80 </span>
        <span aria-hidden="true">/</span>
        <span class="sr-only">out of </span>
        100</span>
     </div>
   </div>
</li>

I have a div (inner element) wrapped in an li (outer element). The outer element will be responsible for the corner borders while the inner element will be responsible for the styles needed for the design. I use inline styling for the outline color and background, but that's because they're applied dynamically through React (on my GitHub). Nonetheless, let's look at the CSS.

li { /* Outer element */
  mask:
    conic-gradient(at 16px 16px, hsla(0 0% 0% / 0) 75%, hsl(0 0% 0%) 0)
    0 0 / calc(100% - 16px) calc(100% - 16px),
    linear-gradient(hsl(0 0 0) 0 0) content-box;
  padding: 5px;
  outline-offset: -5px;
  border-radius: 1rem; /* needed for the rounded corners*/
}

Looking at the CSS, I'll go line by line to explain each property and value except for the border-radius because that's self-explanatory.

  mask:
    conic-gradient(at 16px 16px, hsla(0 0% 0% / 0) 75%, hsl(0 0% 0%) 0)
    0 0 / calc(100% - 16px) calc(100% - 16px),
    linear-gradient(hsl(0 0 0) 0 0) content-box;

This first line is intimidating to look at but it is the magic required for the corner borders (which are actually outlines). The mask uses two layers, a conic-gradient and a linear-gradient. To explain the conic-gradient, at 16px 16px is where the angle or center point at which the gradient rotates. If you visualize a square, it would be 16px from the left and top. hsla(0 0% 0% / 0) 75% is the gradient's first color stop and position. It essentially means that the first 75% of the gradient is transparent. hsl(0 0 0%) 0) is the gradient's second color stop and position and assigns the rest of the gradient with black. 0 0 / calc(100% - 16px) calc(100% - 16px) this last line of the conic-gradient specifies the position and size of the gradient. 0 0 places it in the top left and calc(100% - 16px) calc(100% - 16px) makes it so that it covers the entire element minus the 16px on the X and Y axis.

The linear-gradient is the easier one to understand (lol). (hsl(0 0 0) 0 0) content-box makes it so that a fully black gradient covers the entire content with content-box restricting it from going into the padding.

  padding: 1px;
  outline-offset: -1px;

The padding is the gap between the content and the outline. With the outline being the negative opposite of the padding, the corners become juuuuust visible due to the masking and border-radius.

Again, you may need to adapt this depending on your layout, but this is one way to create borders on just the corners of the summary scores.

Thanks for helping, but still not working no idea. @KirativeWD

For it to work, the HTML structure needs an outer element for the border design and an inner element for the overall design. Your current structure (while it could be updated semantically) uses a single div.

You'll want to wrap .items in another div, perhaps with the class .border so you know what it's for, and apply the CSS above. But again, you may need to tinker with it to get proper results.