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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 --ui-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.

Full access pass

Full access pass

Group bundle

Group bundle

Student pass

Student pass

Workshop ticket

Workshop ticket

Evening meetup

Evening meetup

Speaker dinner

Speaker dinner

4Cinematic hero banner

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

Three days that change how you work

5Map placeholder

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

Zeni Studio286 Hillcrest Road, Lisbon

6Custom 3:2 photo

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

A beginner's guide to getting started
3:2 · Announcing our first keynote speakers

7Portrait team cards

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

Diego Varga

Diego Varga

Marketing Lead

Owen Sato

Owen Sato

QA Engineer

Omar Larsen

Omar Larsen

Backend Engineer

8Vertical stories

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

Story by Leo BrennanLeo
Story by Kai LindqvistKai
Story by Luna NguyenLuna
Story by Ruby OrtegaRuby

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.

Joining online: how the virtual pass works
update

How to choose the right ticket

Jun 4, 2026

11Caption over a gradient

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

AucklandLive streaming

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
Evening meetup
Evening meetup$22.99
Early bird pass
Early bird pass$302.00
Group bundle
Group bundle$2,050

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.

8:04New

What we learned from last year's feedback

10:24

Our favourite tips for busy weeks

13:24

What makes a panel worth watching

17Media list

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

  • How to pitch a talk that gets accepted

    Mar 26, 2026 · 12 min read

  • The small habits that make a big difference

    Aug 9, 2026 · 8 min read

  • Ten talks you should not miss this year

    Feb 9, 2026 · 6 min read

18Responsive ratio

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

Big ideas, small rooms, real conversations

19Round avatars

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

Nadia Patel
Nadia
Ella Duarte
Ella
Mason Delgado
Mason
Ivy Ashford
Ivy

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.