A 100% pure CSS icon implementation of Phosphor Icons using CSS custom properties and SVG masks

• No JavaScript, dependencies, SVGs or webfonts needed!
• 100% accessible, fast and easy-to-use
• Includes all 1513 icons in thin, light, fill, bold, regular and duotone sets
• Icons can be colored any color by setting a background-color:
• Icon can be sized any size by setting height and width of the div (the icon scales to fit using mask-size: contain;)

By using CSS custom properties the icons can also be used as background-images instead of masks if needed.

• Theme-aware — Use a single stylesheet and change icon color via color or CSS variables; no need for separate icon assets per theme.
• One request — All icons live in one CSS file instead of hundreds of SVGs or a webfont, reducing HTTP requests.
• Override locally — Set --ph-icon-* or background-color on any element (or a parent) to style icons without extra classes.
• Smaller payload — Icons are defined once as data URIs in variables; repeated use doesn’t duplicate the SVG data in the DOM.
• No JS — No runtime, no icon components, no tree-shaking step; works with plain HTML/CSS and any framework.
• Cascade-friendly — Icons inherit currentColor and variables from the cascade, so they fit naturally into your design system.

<link rel="stylesheet" href="phosphor-icons-regular.min.css" />
<link rel="stylesheet" href="phosphor-icons-fill.min.css" />
<link rel="stylesheet" href="phosphor-icons-duotone.min.css" />
<link rel="stylesheet" href="phosphor-icons-thin.min.css" />
<link rel="stylesheet" href="phosphor-icons-light.min.css" />
<link rel="stylesheet" href="phosphor-icons-bold.min.css" />

Each stylesheet includes CSS variables and ready-made classes so you can use icons like a webfont:

<i class="ph ph-smiley"></i>

Use the base class ph plus the icon class ph-<name> (e.g. ph-heart, ph-arrow-right). Icons scale with font-size and inherit text color via currentColor.

For custom styling, use the CSS variables directly:

.my-icon {
  background-color: currentColor;
  height: 24px;
  mask-image: var(--ph-icon-heart);
  mask-position: center;
  mask-repeat: no-repeat;
  mask-size: contain;
  width: 24px;
}

Each stylesheet is approx 900 KB (90 KB gzipped) and includes all 1513 icons. I recommend removing icons you don't need to reduce the file size and improve performance.

https://coliff.github.io/phosphor-icons-css-vars/

mask-image is supported unprefixed in all modern browsers (Chrome 120, Safari 15.4, Firefox 53 — caniuse). To widen support (e.g. older Safari), use Autoprefixer to add -webkit-mask-image alongside mask-image. Because this uses CSS variables, the same variables are referenced from :root without increasing filesize. Neat!

MIT