My use case for this CSS is to have a big arrow at the background of a reveal.js slideshow like so. See all the credits in the Credits section, most notably the pen by @LukyVj gave me a head start.
Created
September 5, 2022 21:40
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Easy customizable CSS arrow
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <link rel="stylesheet" href="css/my-arrow.css" type="text/css"> | |
| </head> | |
| <body> | |
| <h1>Easy customizable css arrow</h1> | |
| <div class="arrow"></div> | |
| </body> | |
| </html> |
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| /* | |
| * Easy customizable CSS arrow: | |
| # Change size, position & color w/ global CSS variables | |
| * | |
| * 2022 @pjastam | |
| * http://www.pietstam.nl | |
| * | |
| * Credits | |
| * - CSS arrow: https://codepen.io/LukyVj/pen/AveZjg | |
| * - CSS constants: https://stackoverflow.com/a/48175165 | |
| * - CSS calc: https://stackoverflow.com/a/53244557 | |
| */ |
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| /* == Default page == */ | |
| :root { | |
| box-sizing: border-box; | |
| text-align: left; | |
| font-weight: bold; | |
| background-color: LightGray; | |
| color: Grey; | |
| --custom-top: 150px; | |
| --custom-left: 400px; | |
| --custom-width: 200px; | |
| --custom-height: 100px; | |
| --custom-width-triangle: 150px; | |
| --custom-color: Tomato; | |
| } | |
| /* == Style == */ | |
| .arrow { | |
| position: absolute; | |
| top: var(--custom-top); | |
| left: var(--custom-left); | |
| width: var(--custom-width); | |
| height: var(--custom-height); | |
| background-color: var(--custom-color); | |
| } | |
| .arrow::after { | |
| position: relative; | |
| margin: calc(var(--custom-height) / 2 * -1) calc(var(--custom-width) - 1px); | |
| display: block; | |
| content: ""; | |
| border-top: var(--custom-height) solid transparent; | |
| border-bottom: var(--custom-height) solid transparent; | |
| border-left: var(--custom-width-triangle) solid var(--custom-color); | |
| } |
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