How casinos adapt to different screen sizes

1) Why adaptation is important

Players come with different devices: 4. 7 ″ smartphones, 6. 7 ″ phablets, tablets 8-13 ″, foldables, desktops and TV. Without adaptation, you lose readability, speed and conversion: the cash register breaks, the slots are "cut," the buttons do not fall into the "thumb zone," and live tables do not have enough space to bet.

2) Grids, breakpoints and scaling

Recommended breakpoints:

XS: ≤360px - compact smartphones
SM: 361-480px - most smartphones
MD: 481-768px - large smartphones/small tablets (portrait)
LG: 769-1024px - tablets/small laptops
XL: 1025-1440px - desktop
2XL:> 1440px - wide monitors/TV

Grid:

Smartphones: 4-6 speakers, 8px step.
Tablets: 8-12 columns, 8-12px step.
Desktop: 12-24 columns, 12-16px step.
Use fluid-layout (clamp ()) for widths and typography: 'font-size: clamp (14px, 1. 6vw, 18px)`.

Game Cards:

XS/SM: 2 columns (card ≥156 -180px).
MD: 3-4 columns.
LG/XL: 5-8 columns with "rows" by provider/genre.
Keep the cover ratio 16:9 or 1:1 (for slots), avoid "croning" previews.

3) "Thumb zones" and clickability

Basic CTA (Deposit, Play, Continue) - bottom right on smartphones (right-handed) or center-bottom.

Minimum target for touch: 44 × 44pt iOS/48 × 48dp Android.

Between targets - at least 8px.

Critical actions (confirmation of output/bet) - two-step on narrow screens.

4) Portrait vs landscape

Portrait (default for mobile):

Slots in the "frame" 16:9, betting panel at the bottom, swipes for changing denomination/lines.
Lobby "card wall" + bottom navigation (5 points maximum).

Landscape:

Enlarge the canvas of the game; sidebars for history and chat in live games.
At the checkout - two-column form: methods/amounts on the left, confirmation on the right.
For UX - do lock orientation in separate modes (live tables, video).

5) Foldable devices and tablets

Foldables (clamshell/book):

Use window segments: show two panels on the "internal" screen (game + lobby/chats/missions).
Watch out for hinge-gutter (loop): you cannot put buttons under it.

Tablets:

Left permanent sidebar (navigation/filters), right - content.
In live games - "three-panel": video, bets, statistics.

6) Safe areas, cutouts and system panels

Use safe-area insets (iOS) and 'env (safe-area-inset-)' for indentation under cutouts/round corners.

On Android, consider gesture navigation (bottom swipe): do not hide CTA at the very edge.

In WebView/PVA - set'viewport-fit = cover '.

7) Game scaling: slots, live, minigames

Slots (canvas/WebGL/iframe):

Container with aspect-ratio (for example, 16/9) and 'object-fit: contain'.
DPI adaptation: render in devicePixelRatio 1-2 (balance of quality and battery).
UI layers - rem/logical units, not "picture pixels."

Live Casino:

Adapt the video stream to 360p→720p depending on the width.
The betting panel is flexible: compact chips/mesh on a mobile, a full table on a tablet/desktop.
Chat/History - slider or sidebar.

Minigames/jackpots/scratches:

Support for one-hand mode, large buttons, refusal of "small hits."

8) Box office and forms on different diagonals

Smartphone: step-by-step wizard (method → amount → confirmation).

Tablet/desktop: split-form (methods on the left, details on the right).

Keyboard: squeeze content with focus; fix the CTA above the keyboard.

Input masks and autocomplete, Apple Pay/Google Pay - system dialogs so as not to "break" the layout.

9) Typography and contrast

Base size: 16px (SM) → 18px (MD) → 20px (LG +), via 'clamp ()'.

Line ≥ 1. 4, WCAG AA/AAA contrast for text on video feeds.

Headings and balance digits - tabular lining for stable width.

10) Performance and Metrics (Core Web Vitals)

LCP: <2. 5 s on mobile (critical cover preload/App Shell).

CLS: <0. 1 (reserve height for banners/images).

INP/TBT: minimize blocking JS, lazily load providers.

Graphics: WebP/AVIF, adaptive 'srcset/sizes', caching and Service Worker for PWA.

11) Accessibility and internationalization

Text size - scalable (respect user font size).

On-screen readers: aria tags for bet/checkout buttons, focus traps in modals.

RTL languages - interface mirroring, exchange rate/currency formats.

Color coding (red/green) - duplicate with icons/captions.

12) Diagonal navigation patterns

Smartphone: bottom-nav ≤5 items + "Profile/Balance" in the header.

Tablet: permanent left nav-rail.

Desktop: top menu + filters on the left.

Quick actions (Deposit, Favorites, Search) - always within 60-100px of your thumb.

13) Anti-overlay, pop-up and "advertising"

One modal window at a time, adaptive height (90vh mobile).

Bonus banners without layout shift: fix the height, use skeleton.

Do not overlap system gestures and browser buttons.

14) Pixel density and icons

Icon packs: 1x/2x/3x; SVG where possible.

Hairline - ≥ 1px is logical (consider DPR).

Screenshots of games and providers - retina-quality with compression.

15) PWA/Web Containers and WebView

Manifest: 'display = standalone', 512 + icons, theme splash screen.

'viewport-fit = cover ', safe areas, offline shell.

In WebView, disable arbitrary schemes/injections, enable SSL pinning in the native shell (if used).

16) Content Blocks and Sizing Guidelines

Hero banner:

SM: height 32-40vh, one CTA.
LG +: 30-35vh, two CTAs + 2-column promo text.
Game lists: 6-12 cards per screen, "endless tape" with pagination of 20-30.
Live widget: at least 320 × 180 on mobile, 640 × 360 on tablet.

17) Pre-release design checklist

1. Checked breakpoints XS→2XL, portrait/landscape, split-screen.

2. CTA inside the "thumb zone," target ≥44×44pt.

3. Slots/live are scaled in aspect-ratio, without clipping UI.

4. The cash desk works on one page (mobile) and in split mode (tablet/desktop).

5. Notches/cutouts and safe-area are taken into account; 'viewport-fit = cover'.

6. Core Web Vitals in the green zone; no sharp CLS from banners/fonts.

7. WCAG contrasts and dimensions; accessibility for readers.

8. Locales/RTL, currencies and long lines do not break the grid.

9. PWA: manifest, SW, offline fallback, retin icons.

10. Test on foldables/tablets: two panels, hinge-gutter taken into account.

18) Frequent errors and quick fixes

"Rubber" height without limit → use'aspect-ratio 'and containers.

CTA at the very edge of the → add 'safe-area' and internal indents.

Tiny betting chips → increase to 44-48dp, increase contrast.

Jumping banners → reserve height, preload fonts.

FPS drops in slots → reduce the DPR of the render to 1. 5-2, limit animations, use WebGL optimization.

19) FAQ

Do I need to make separate layouts for tablets?

Yes: "emptiness" is growing on tablets; use a two-/three-panel layout.

Why not just "responsive"? Why breakpoints?

The fluid approach is good, but content fractures (panels, number of columns, type of navigation) require explicit breakpoints.

Where to have a cash register on mobile?

Separate fullscreen step flow, CTA at the bottom, fixation above the keyboard.

How to behave with live video?

Dynamically change the quality across the width; save 16:9; chat and bets - in side/bottom panels depending on orientation.

Adapting casinos to different diagonals is a systematic work with nets, breakpoints, safe zones and performance, plus a well-thought-out gaming canvas for slots and live games. Observing the described patterns (thumb zones, aspect-ratio, split panels on tablets, PWA-best practices) and controlling metrics, you get a fast, readable and conversion product on any screen - from 4. 7 smartphone ″ up to 27 desktop ″ and foldable devices.