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Lumen Co

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.

School kit

School kit

Monthly gift

Monthly gift

Solar lamp

Solar lamp

Meal pack

Meal pack

Shelter support

Shelter support

Tree planting

Tree planting

4Cinematic hero banner

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

Small acts, big impact

Clean water wells are built with and maintained by local communities.

5Map placeholder

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

Lumen Co369 Orchard Close, Vancouver

6Custom 3:2 photo

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

How to choose the right campaign
3:2 · Looking back at a busy season

7Portrait team cards

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

Kai Ashford

Kai Ashford

Content Writer

Sofia Harlow

Sofia Harlow

Finance Lead

Owen Ortega

Owen Ortega

Content Writer

8Vertical stories

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

Story by Liam MoreauLiam
Story by Diego DuarteDiego
Story by Arjun SatoArjun
Story by Maya QuinnMaya

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.

Meet the partners behind our water projects
tutorial

Why we plant trees with the schools we build

May 3, 2026

11Caption over a gradient

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

AustinAnimal rescue

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
Clean water well
Clean water well$525.00
Teacher training
Teacher training$109.99
Emergency fund
Emergency fund$48.00

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.

7:24New

What our donors asked us most

9:02

Our yearly impact report, explained

13:05

The small habits that make a big difference

17Media list

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

  • Five things we learned this year

    Aug 5, 2026 · 11 min read

  • How your donations built three new classrooms

    Aug 5, 2026 · 5 min read

  • Why monthly giving makes such a difference

    Oct 1, 2026 · 11 min read

18Responsive ratio

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

Real help, where it is needed most

19Round avatars

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

Samir Alvarez
Samir
Noah Mensah
Noah
Tariq Kim
Tariq
Ava Ortega
Ava

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.