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Editorial Team
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Asked: 2026-06-09T22:29:17+00:00

I’ve been trying to figure out how to make a custom shape in CSS

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I’ve been trying to figure out how to make a custom shape in CSS that visually will look like this:

shape with cut out edges and border

With the property of background:rgba(44, 44, 48, 0.9) and border:6px solid rgba(29, 30, 35, 0.9);

My problem is that I cannot find a way to make the top-right and bottom-left border look like the image I provided. Tried the tips on CSS Custom Shape on CSS-Tricks but it doesn’t seem to solve the problem as it cannot have background. Any ideas?

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1 Answer

  1. Editorial Team

    Unfortunately you cannot have a pseudo-element added to a pseudo-element (i.e. :after:after{} will not work) – with a complex shape like yours, you might have to cheat a little and rely on pseudo-elements of its children.

    <div class="fancy-box">
    <h2>Title</h2>
    <p>Content</p>
</div>

.fancy-box{/*container, top+bottom borders*/}
.fancy-box:before{/*left-top "square" corner*/}
.fancy-box:after{/*right-bottom "square" corner*/}
.fancy-box>p:before{/*left-bottom "dog ear" border*/}
.fancy-box>p:after{/*right-top "dog ear" border*/}
.fancy-box>h2:before{{/*left-bottom "dog ear" background*/}
.fancy-box>h2:after{/*right-top "dog ear" background*/}

    Again, this fiddle shows you how it would work with solid colors (reasonably well, although I don’t like the “thinner” angles) – but this would fail when you apply opacity. Your best would probably be around having “dog ears” made into pre-rendered semitransparent PNGs, for extra credit you could base64-encode them.

    The “solution” above is a complete semantic horror though – you may have better luck using multiple backgrounds with pre-rendered graphics.

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