All tools › The shape of a box
Tooltip with a pointer
A label that points at its element, and the sentence about what hover alone leaves out.
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
- Which side
- Choices: Above, Below, Left, Right.
- Background
- The two shadows are worked out from this, not from black and white.
- Colour
- A hex code, an `rgb()` or a CSS colour name.
- Pointer size
- A number from 2 to 40.
- Corner radius
- A number from 0 to 32.
- Only on hover
- Off, the label is always visible; on, the focus rule beside it is what keeps a keyboard working.
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
Clip a shape
An element cut down to a shape, and the sentence about what else the cut takes with it.
Triangles and arrows
A triangle from borders or from a clip path, with what each of the two costs.
Keep a proportion
A box that keeps its shape at any width, with the padding fallback whose percentage is of the width.
Cut text short
One line or several, with the ellipsis — and the sentence about what a screen reader still reads.
Text in columns
Columns by width rather than by count, with the rule that keeps a heading with its paragraph.
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