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To make a page mobile-friendly, find where its layout actually fails, then adjust the layout at that width—not at an assumed phone size. To give an AI coding assistant a clean starting point, open the project it needs, remove unrelated context from the workspace, and state the files, behavior, and constraints clearly. Review the resulting code and test it at multiple viewport widths before keeping it.
How should you choose mobile breakpoints?
Start with the page’s content. Narrow the browser window and note the first real problem: navigation items wrap, cards become cramped, a fixed-width element causes horizontal scrolling, or text becomes difficult to scan. That point is a reason to change the layout.
Anthropic’s October 10, 2025 guide, Build responsive web layouts, gives 768px and 1024px as example breakpoint widths, but says the right values depend on the content. For example, a particular navigation menu might need to change at 920px if its items wrap. Treat all three widths as illustrations, not universal device categories or prescriptions.
Build a fluid layout before adding breakpoints
A narrow-screen, single-column layout is a useful starting point. Add columns when the available width can accommodate them. In this example, the media queries represent possible layout changes; choose their actual widths by checking where the content needs them.
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.card-grid {
display: grid;
grid-template-columns: 1fr;
gap: 1rem;
}
@media (min-width: 40rem) {
.card-grid {
grid-template-columns: repeat(2, minmax(0, 1fr));
}
}
@media (min-width: 64rem) {
.card-grid {
grid-template-columns: repeat(3, minmax(0, 1fr));
}
}The one-, two-, and three-column progression is an illustrative pattern, not a rule that every project should use these column counts or widths. CSS Grid is useful when both rows and columns matter; Flexbox suits one-dimensional arrangements that can wrap. For card grids, auto-fit with minmax() can let columns adapt to available space without adding a media query for every change. Use explicit media queries when a component needs a deliberate change at a content-driven width.
A community-maintained example, AsadSumbul’s mobile-responsive repository, describes fluid widths, text sizing with clamp(), reflowing cards, and checking for horizontal overflow across widths from 320px to large desktop sizes. Those are techniques in that repository, not a web standard or a requirement for every page.
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Give an AI coding assistant a clean starting point
A useful prompt makes the task and its boundaries explicit. Name the page or feature, describe the desired narrow-screen behavior, identify relevant files, and specify what should not change. For example:
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Make the product-card grid in src/styles.css work on narrow screens. Keep one card per row when the cards would otherwise be cramped, and use multiple columns when they fit. Do not change the page content or introduce a new framework. Explain the breakpoint you choose and list the files you change.GitHub’s Vibe coding with GitHub Copilot tutorial offers a tool-specific setup example: open the repository as the project workspace, and close unrelated editor tabs during the initial research stage so Copilot is not influenced by code or information in those tabs. The tutorial starts from a repository with a README and a local project workspace. The point is to reduce distracting context, not to delete documentation or hide requirements the assistant needs.
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That setup is specific to the tutorial; assistants can use workspace context differently. Keeping the README, relevant source files, and project constraints available gives an assistant useful context while avoiding unrelated open material.
Review and test what the assistant changes
Generated code is a proposal, not a guarantee. Chrome for Developers’ Get started with Modern Web Guidance warns that “AI coding agents tend to default to older, outdated solutions to modern web development problems.” It also recommends accounting for project requirements and browser-support criteria. If compatibility matters, state the project’s target rather than assuming the generated code will choose it correctly.
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- Ask for the rationale. Have the assistant explain why it chose each breakpoint and identify the files it changed.
- Inspect the diff. Check that the change is limited to the requested layout and does not introduce unwanted dependencies or alter unrelated behavior.
- Test more than one width. Anthropic’s guide illustrates checking at 320px and 512px. Those are example test widths, not proof that every device or viewport will work. Also test the width where the original problem appeared and any larger layout that the change affects.
- Look for specific failures. Check for horizontal scrolling, overlap, clipped content, cramped controls, and navigation that wraps awkwardly.
- Keep a recoverable version. GitHub’s tutorial recommends reviewing changed files and committing successful iterations. A commit gives you a known project state to return to if a later change makes the layout worse.
The mobile-responsive repository also describes an optional Playwright overflow checker. It is a community tool, not a required dependency; manual inspection at the widths your page must support remains useful.
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| Approach | Useful when | Trade-off |
|---|---|---|
| Content-led media query | A component needs an intentional change at a known width, such as navigation switching before its items wrap. | You control the transition explicitly, but must choose and verify the width against the content. |
| Intrinsic Grid or Flexbox layout | Items can reflow naturally as space becomes available; Grid’s auto-fit and minmax() can adapt card columns. |
It can reduce the need for fixed breakpoints, but may not provide a specific structural change the design requires. |
Choose an AI workflow that fits the project
Anthropic’s guide distinguishes between using Claude.ai to generate and learn responsive foundations and Claude Code to inspect and modify an existing codebase. These are the vendor’s descriptions of its products, not a guarantee that either workflow is right for every project. For a small page, a focused prompt and a browser check may be sufficient; for an existing project, codebase-aware work can make it easier to account for related files and constraints.
Likewise, a clean starting context does not mean an empty project. Keep the files and documentation that define the work, remove only unrelated distractions, and ask for a narrow change that you can review.
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