All tools › The shape of a box
Keep a proportion
A box that keeps its shape at any width, with the padding fallback whose percentage is of the width.
It runs entirely in this browser tab: the CSS you paste is never uploaded, and the preview is drawn from the same numbers the rule carries rather than rendered by the browser — which is why a tool whose effect only exists in a compositor says so instead of drawing one.
Settings
- Proportion
- Choices: 16:9, 4:3, 1:1, 21:9, 3:2, 9:16.
- Add a fallback
- What happens where the newer property is not understood.
- Fill the frame
- The rules that make what is inside fill the frame without stretching.
How to use it
- Paste your text into the box above, or open a file.
- Adjust the settings beside it until the result is what you wanted.
- Copy the result, or save it as a file. The result updates as you type.
Questions
- Is what I paste uploaded anywhere?
- No. The whole application is carried as WebAssembly and runs on your own device. There is no server to send a stylesheet to, and no tool here makes a network request while it works.
- Is the preview what my browser will actually draw?
- For a colour, a shape and a curve, yes — it is drawn from the same numbers the rule carries. For anything a browser's compositor does against the page behind it — a backdrop filter, a blend mode, a scrollbar — no, and that tool says so on its own result rather than showing you an approximation.
- Why does a size come out as 1.125rem and not 1.1250000000000002rem?
- Because none of the arithmetic is done in binary floating point. Every length here is an exact decimal, so a conversion ends where it should: 18px is 1.125rem and 24px is 18pt, with no run of nines and no stray four at the twelfth place.
- Can I use these rules without attribution?
- Yes. What comes out is CSS — a declaration is not a work with an owner, and nothing here writes a comment into your stylesheet about where it came from.
Other tools for the shape of a box
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Triangles and arrows
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Tooltip with a pointer
A label that points at its element, and the sentence about what hover alone leaves out.
Cut text short
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Text in columns
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