reveal.js/css/layout.scss

/**
 * Layout helpers.
 */

// Stretch an element vertically based on available space
.reveal .stretch,
.reveal .r-stretch {
	max-width: none;
	max-height: none;
}

.reveal pre.stretch code,
.reveal pre.r-stretch code {
	height: 100%;
	max-height: 100%;
	box-sizing: border-box;
}

// Text that auto-fits its container
.reveal .r-fit-text {
	display: inline-block; // https://github.com/rikschennink/fitty#performance
	white-space: nowrap;
}

// Stack multiple elements on top of each other
.reveal .r-stack {
	display: grid;
	grid-template-rows: 100%;
}

.reveal .r-stack > * {
	grid-area: 1/1;
	margin: auto;
}

// Horizontal and vertical stacks
.reveal .r-vstack,
.reveal .r-hstack {
	display: flex;

	img, video {
		min-width: 0;
		min-height: 0;
		object-fit: contain;
	}
}

.reveal .r-vstack {
	flex-direction: column;
	align-items: center;
	justify-content: center;
}

.reveal .r-hstack {
	flex-direction: row;
	align-items: center;
	justify-content: center;
}

// Naming based on tailwindcss
.reveal .items-stretch { align-items: stretch; }
.reveal .items-start { align-items: flex-start; }
.reveal .items-center { align-items: center; }
.reveal .items-end { align-items: flex-end; }

.reveal .justify-between { justify-content: space-between; }
.reveal .justify-around { justify-content: space-around; }
.reveal .justify-start { justify-content: flex-start; }
.reveal .justify-center { justify-content: center; }
.reveal .justify-end { justify-content: flex-end; }