CSS Border Generator
Design a border visually — width, style (solid, dashed, dotted, double…), color and radius — with live preview.
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The border Property
Shorthand: border: width style color, e.g. border: 2px dashed #5b3df5. Styles include solid, dashed, dotted, double, groove, ridge, inset and outset. Combine with border-radius for rounded frames, or style single sides (border-top, …) for accents like tab underlines.
Frequently Asked Questions
Why does my border change the element size?
By default borders add to the box dimensions. Set box-sizing: border-box so width and height include the border — the modern standard most resets apply.
How thick must a border be for double to show?
The double style needs at least 3px — two lines plus the gap between them. Below that it renders as a single line.
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CSS Border Generator