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Ratio

The ratio helper keeps a box at a fixed aspect ratio whatever its width, which is perfect for media placeholders, thumbnails, galleries and banners. Pick ratio-1x1, ratio-4x3, ratio-16x9 or ratio-21x9, or set any ratio with the --bs-aspect-ratio variable.

1The four built-in ratios

ratio-1x1, ratio-4x3, ratio-16x9 and ratio-21x9 next to each other, filled with a plain div.

1:1
4:3
16:9
21:9

2Video placeholder

A 16:9 poster image with a centred play button, ready for a video player of your choice.

Video poster

3Square product thumbnails

ratio-1x1 with object-fit-cover gives every product the same tile, whatever the photo size.

Chef's tasting plate

Chef's tasting plate

Seasonal soup

Seasonal soup

Lemon tiramisu

Lemon tiramisu

Garden salad

Garden salad

Espresso martini

Espresso martini

Slow-cooked lamb

Slow-cooked lamb

4Cinematic hero banner

ratio-21x9 for a wide banner with a headline overlay.

Dinner worth getting dressed up for

Friendly people answer your questions quickly, by phone, chat or email.

5Map placeholder

A 4:3 box reserved for a map, showing the address until the map loads.

Wrenora83 Lakeview Terrace, Edinburgh

6Custom 3:2 photo

Any ratio works with the --bs-aspect-ratio variable: 2 / 3 = 66.67% for classic photo prints.

What our guests asked us most
3:2 · Five things we learned this year

7Portrait team cards

A 3:4 portrait ratio (133.33%) for team photos in cards.

Elena Whitaker

Elena Whitaker

Data Analyst

Ivy Brennan

Ivy Brennan

Backend Engineer

Kenji Varga

Kenji Varga

Backend Engineer

8Vertical stories

A 9:16 ratio (177.78%) for phone sized stories or short clips in a scrolling row.

Story by Kai LarsenKai
Story by Tariq HarlowTariq
Story by Amara IbrahimAmara
Story by Omar HaddadOmar

9Chart area

A 16:9 box that keeps a simple bar chart in proportion on every screen.

Monthly bookings

10Blog card cover

ratio-16x9 as a card image keeps every post card in a grid the same height.

Five wines to pair with a summer dinner
update

Our favourite tips for busy weeks

Apr 8, 2026

11Caption over a gradient

A 4:3 image with a gradient overlay so white caption text stays readable.

LisbonWine pairing

12Mixed ratio gallery

Combining 1:1, 4:3 and 16:9 tiles in one responsive grid.

Gallery photo 1
Gallery photo 2
Gallery photo 3
Gallery photo 4

13Thumbnails in table cells

A small ratio-1x1 box keeps order line images square inside a table.

ImageItemPrice
Garden salad
Garden salad$12.00
Chef's tasting plate
Chef's tasting plate$43.99
Seasonal soup
Seasonal soup$9.00

14Empty cover placeholder

A dashed 4:3 area that reserves space for an image that has not been chosen yet.

No cover image yet

15Colour swatches

Empty square ratios make perfect colour swatches for a style guide.

primary

primary

secondary

secondary

success

success

info

info

warning

warning

danger

danger

16Video thumbnails with badges

Duration and status badges positioned over 16:9 thumbnails.

14:18New

What is new on our winter menu

6:56

Planning the perfect birthday dinner

9:41

Our chocolate tart, step by step

17Media list

Fixed width 4:3 thumbnails beside article titles in a reading list.

  • A beginner's guide to getting started

    Jul 20, 2026 · 10 min read

  • Looking back at a busy season

    Dec 10, 2025 · 4 min read

  • Vegan dishes worth crossing town for

    Jan 4, 2026 · 7 min read

18Responsive ratio

A small custom class changes --bs-aspect-ratio per breakpoint: square on phones, 21:9 on tablets and up.

Come hungry, leave happy

19Round avatars

ratio-1x1 with rounded-circle keeps profile pictures perfectly round even when the source is not square.

Chloe Tanaka
Chloe
Mia Carter
Mia
Ruby Hughes
Ruby
Isla Okafor
Isla

20Loading skeleton

A 16:9 placeholder block with placeholder-glow while the real image and text load.

The skeleton reserves the exact space, so the page does not jump when content arrives.