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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.

VIP pass

VIP pass

Panel day ticket

Panel day ticket

Student pass

Student pass

Group bundle

Group bundle

Full access pass

Full access pass

Recording pass

Recording pass

4Cinematic hero banner

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

Learn, connect and get inspired

Group tickets include a private meeting room for your team.

5Map placeholder

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

Koraan Hub232 Cedar Lane, Austin

6Custom 3:2 photo

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

How to choose the right ticket
3:2 · Joining online: how the virtual pass works

7Portrait team cards

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

Isla Haddad

Isla Haddad

Project Manager

Lea Tanaka

Lea Tanaka

HR Partner

Samir Larsen

Samir Larsen

HR Partner

8Vertical stories

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

Story by Chloe MorganChloe
Story by Luna VargaLuna
Story by Noah NovakNoah
Story by Felix OrtegaFelix

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.

A guide to the city for visiting attendees
news

Five things we learned this year

Feb 8, 2026

11Caption over a gradient

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

AucklandTicketing

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
Workshop ticket
Workshop ticket$142.00
Panel day ticket
Panel day ticket$207.00
Early bird pass
Early bird pass$317.00

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.

9:02New

Ten talks you should not miss this year

10:54

Looking back at a busy season

14:51

How to pitch a talk that gets accepted

17Media list

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

  • How to get the most out of a conference

    Jul 1, 2026 · 7 min read

  • What makes a panel worth watching

    Jan 10, 2026 · 5 min read

  • Announcing our first keynote speakers

    Oct 14, 2026 · 11 min read

18Responsive ratio

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

Experiences people talk about

19Round avatars

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

Zoe Nguyen
Zoe
Ella Patel
Ella
Nadia Lindqvist
Nadia
Jonah Alvarez
Jonah

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.