CSS Triangle Generator: Pure CSS Shapes
Create triangles, arrows, and chevrons with pure CSS — no images, no SVG, just border tricks.
Published:
Tags: CSS triangle generator, CSS arrow shape, pure CSS shapes
CSS Triangle Generator: Pure CSS Shapes CSS triangles require no images, no SVG, no JavaScript — just a zero-dimension element and the border trick. They are the right choice for tooltip carets, accordion arrows, directional indicators, and simple decorative elements that need to match the surrounding styles. --- What is The Border Trick Explained? An element with and has no visible area — but its borders still render. When borders meet at a zero-size point, each one forms a triangle occupying a quadrant: To get a single triangle: make three borders and keep one colored. --- What is Directional Triangles? Pointing Down Pointing Up Pointing Right Pointing Left --- What is Tooltip with Arrow? A common pattern: a tooltip box with a caret pointing toward its target. --- What is Right-Angle…
Frequently Asked Questions
How do I make a triangle in CSS?
Set an element's `width` and `height` to `0`, then use borders to create the shape. Make three borders transparent and one colored. The colored border determines the direction the triangle points — a colored `border-bottom` creates an upward-pointing triangle, a colored `border-top` creates a downward one.
How do I make a tooltip arrow in CSS?
Create a pseudo-element (`:before` or `:after`) on the tooltip, set its dimensions to 0, and apply the border trick. Position it with `position: absolute` relative to the tooltip container. For a tooltip that points down, use a colored `border-top` on the pseudo-element and position it below the tooltip box.
What is the CSS border trick for triangles?
When you set `width: 0; height: 0` on an element, the borders meet at the element's center point rather than forming a box. Making three borders transparent and giving one a color reveals a solid triangle in the direction of the colored border. The size of the triangle is controlled by the border-width values.
How do I make a downward arrow in CSS?
Use `width: 0; height: 0; border-left: 10px solid transparent; border-right: 10px solid transparent; border-top: 16px solid currentColor`. The `border-top` color forms the fill of the downward triangle; its height determines how tall the triangle is. The `border-left` and `border-right` widths control how wide it is.
When should I use SVG instead of CSS shapes?
Use SVG when you need complex multi-path shapes, arbitrary curves, or shapes that must scale perfectly to any size in a design system icon set. Use CSS triangles and borders for simple directional arrows, tooltip carets, and decorative shapes that are tightly coupled to component styling. CSS shapes respond to `currentColor` and CSS variables natively.
All articles · theproductguy.in