Box Sizing

Controls the calculation of the total size of an element.

This feature is well established and works across many devices and browser versions.

Chrome

Edge

Firefox

Safari

bs-bbbox-sizing: border-box;

bs-cbbox-sizing: content-box;

Content Box

Initial value

The element's width and height do not include padding and borders.

Content

<div class="d-26 bs-cb p-8">
  <div class="ai-c bg-indigo d-f d-full jc-c c-white">Content</div>
</div>

The element's width and height include padding and borders.

Yumma CSS uses the border-box CSS property by default. Learn more about it in the base styles docs.

Box

<div class="d-26 bs-bb p-8">
  <div class="ai-c bg-indigo d-f d-full jc-c c-white">Box</div>
</div>

Learn how to override existing utilities based on the user's screen size or other factors, such as hover states.

Target different screen sizes by adding breakpoint prefixes. Styles apply from the specified breakpoint and up.

Target specific viewport sizes with breakpoint prefixes

sm:bs-[value]

Small≥640px

md:bs-[value]

Medium≥768px

lg:bs-[value]

Large≥1024px

xxl:bs-[value]

Extra Large≥1536px

Apply styles conditionally when users hover over an element using the h: prefix.

Add the h: prefix to apply styles only when the user hovers over the element.

Syntax:h:bs-[value]