Created
May 3, 2011 05:43
-
-
Save romannurik/952863 to your computer and use it in GitHub Desktop.
A simple CSS trick to create a horizontally- or vertically-centered 'selected' callout triangle using zero images.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| margin: 40px; | |
| } | |
| a { | |
| display: inline-block; | |
| height: 24px; | |
| font-size: 24px; | |
| line-height: 24px; | |
| text-align: center; | |
| font-family: helvetica, sans-serif; | |
| text-decoration: none; | |
| color: #000; | |
| padding: 20px 60px; | |
| background-color: #ddd; | |
| margin-right: 2px; | |
| position: relative; | |
| } | |
| a:target { | |
| background-color: #333; | |
| color: #fff; | |
| } | |
| a:target:before, | |
| a:target:after { | |
| position: absolute; | |
| border: 10px solid transparent; | |
| bottom: 0; | |
| display: block; | |
| border-bottom: 10px solid #fff; | |
| content: ''; | |
| line-height: 0; | |
| } | |
| a:target:before { | |
| right: 50%; | |
| border-right: 0; | |
| } | |
| a:target:after { | |
| left: 50%; | |
| border-left: 0; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <a href="#foo" id="foo">foo</a> | |
| <a href="#bar" id="bar">bar</a> | |
| <a href="#baz" id="baz">baz</a> | |
| </body> | |
| </html> |
Why not use one of the triangles from the Unicode character set?
No need to use both :after and :before - one of them is sufficient.
@phloe I needed to use both :before and :after to do the centering. One is sufficient to make a triangle that's left or right-alined.
@jzaefferer yes, you can do that, try for starters messing with bottom:-20px and using border-top instead of border-bottom.
@romannurik: Yes, I know you did - but I didn't :D
Take a look at my gist fork; it uses negative margin to compensate the centering.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Could you use that to display the triangle outside the element, pointing at something else?