Glass

Codebase contains some partially transparent white or black backgrounds that have a blur filter applied. These can be used as glassmorphic overlays in your web designs.

• bg-black-glass-1 / bg-black-glass-2 / bg-black-glass-3 / bg-black-glass-4 / bg-black-glass-5
• bg-white-glass-1 / bg-white-glass-2 / bg-white-glass-3 / bg-white-glass-4 / bg-white-glass-5

Note: Browsers that do not support background-blur filters will simply get a partially transparent tint instead.

Glass over a dark background image

Dark glass bg-black-glass-* utilities over a dark background image:

(None)

-1

-2

-3

-4

-5

Light glass bg-white-glass-* utilities over a dark background image:

(None)

-1

-2

-3

-4

-5

Photo by Pixabay from Pexels.

Glass over a light background image

Dark glass glass-black-* utilities over a dark background image:

(None)

-1

-2

-3

-4

-5

Light glass glass-white-* utilities over a dark background image:

(None)

-1

-2

-3

-4

-5

Photo by Ollie Craig from Pexels.

Notes on glass

These glassmorphic overlays utility classes can be used in various ways. There are a couple of examples in the Codebase docs:

1. The Codebase documentation uses bg-black-glass-5 for its topbar and bg-white-glass-5 for its sidebar (but you will only see the sidebar glass when it is an offcanvas panel on narrow viewports).
2. Demos of modal components have a backdrop that uses bg-black-glass-3.
3. Demos of hero components have an overlay that uses bg-white-glass-3.

When you have your own background images, you can lay out panels and cards as an overlay (i.e. on a higher z-axis) and give them a glass background appropriate to your design.

Glass CSS variables

The glass utility classes are comprised of separate CSS variabled for rgba() alpha channel (tint) and background blur filter in the :root{}:

--alpha-1: 0.1;
--alpha-2: 0.23;
--alpha-3: 0.35;
--alpha-4: 0.58;
--alpha-5: 0.8;
--glass-1: saturate(1.8) blur(1px);
--glass-2: saturate(1.8) blur(4px);
--glass-3: saturate(1.8) blur(8px);
--glass-4: saturate(1.8) blur(13px);
--glass-5: saturate(1.8) blur(18px);

Of course, you can use different colors for greating a tinted glass effect. I don’t know what colors you will choose for your design – therefore Codebase contains only black and white glass background colors, allowing the colors from underlying images to show through.

• You can use one of the backdrop filters (glass blurs) with your own RGBA (or HSLA) color, adding your own alpha channel or one from Codebase (see above).
• Alternatively, you can use the backdrop filters without an alpha channel color (i.e. a transparent background).

Note: at the present time (November 2022) you still need to include a -webkit-backdrop-filter for Mac/iOS Safari.

Examples:

filter only (no tint)

filter plus blue tint

Photo by Oleg Magni from Pexels.

/* Filter only */
backdrop-filter: var(--glass-2);
-webkit-backdrop-filter: var(--glass-2);

/* Filter plus blue tint */
background-color: rgba(0, 0, 153, 0.4);
backdrop-filter: var(--glass-2);
-webkit-backdrop-filter: var(--glass-2)