アウトラインとリングのユーティリティ
ring-*ユーティリティを使ってアクセシブルなフォーカスインジケーターを追加します。要素の外側に描画されるため、レイアウトに影響しません。
「アウトラインとリングのユーティリティ」はCoddyKit上の無料Tailwind CSS Academyレッスンです。 これはレッスン4/4です。 下記で完全なレッスンを無料で読むことができます。その後、ブラウザ内の組み込みコードエディタと24時間対応のAIチューターでハンズオン演習できます。 これはTailwind CSS Academy学習パスの一部であり、ウェブとCoddyKitアプリ全体で進捗が同期されます。 Tailwind CSS Academyコースには全4レッスンが含まれています。
このレッスンの一部はまだ翻訳されておらず、英語で表示されています。
Why Outlines and Rings Matter
When users navigate with a keyboard or screen reader, visible focus indicators are essential for knowing which element is active. Browsers provide a default focus outline, but many designers suppress it with outline-none without providing an accessible replacement. Tailwind's ring-* utilities are designed precisely for this — they create visible, accessible focus indicators that look better than the browser default without sacrificing accessibility.
<!-- Accessible focus ring replacing browser default -->
<button class="bg-blue-500 text-white px-4 py-2 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2">
Press Tab to focus me
</button>How Ring Utilities Work
Tailwind's ring is implemented using box-shadow, not the CSS outline property. This means it participates in shadow stacking and can be combined with other box shadows. The ring-* utilities set the ring width, ring-{color} sets the color, and ring-offset-* adds a gap between the element and the ring. Unlike outlines, rings do not affect layout and work correctly with border-radius.
<!-- Ring details: width + color + offset -->
<div class="flex gap-6 p-6">
<!-- Width only -->
<button class="bg-gray-200 px-4 py-2 rounded focus:ring-2 focus:outline-none">
Ring width 2
</button>
<!-- Width + color -->
<button class="bg-gray-200 px-4 py-2 rounded focus:ring-2 focus:ring-blue-500 focus:outline-none">
Colored ring
</button>
<!-- Width + color + offset -->
<button class="bg-gray-200 px-4 py-2 rounded focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 focus:outline-none">
Ring with offset
</button>
</div>Ring Width Utilities
Ring widths range from ring-0 (no ring) to ring-8 (8px). The most commonly used values are ring-1, ring-2, and ring-4. A ring-2 creates a noticeable but not overwhelming focus indicator. Note that unlike border-*, there is no directional control — rings always surround the entire element on all sides.
<!-- Ring width scale -->
<div class="flex gap-4 flex-wrap p-6">
<div class="w-16 h-16 bg-white rounded-lg ring-1 ring-blue-500 flex items-center justify-center text-xs">ring-1</div>
<div class="w-16 h-16 bg-white rounded-lg ring-2 ring-blue-500 flex items-center justify-center text-xs">ring-2</div>
<div class="w-16 h-16 bg-white rounded-lg ring-4 ring-blue-500 flex items-center justify-center text-xs">ring-4</div>
<div class="w-16 h-16 bg-white rounded-lg ring-8 ring-blue-500 flex items-center justify-center text-xs">ring-8</div>
</div>Ring Color and Opacity
Set the ring's color with ring-{color}-{shade}, such as ring-indigo-500 or ring-green-400. The ring color should have sufficient contrast with both the element background and the page background. You can also apply opacity with the slash modifier: ring-blue-500/50 for a semi-transparent ring. This creates a softer glow effect while still maintaining adequate visibility.
<!-- Semantic ring colors for different states -->
<div class="space-y-3 max-w-xs">
<input class="w-full border border-gray-300 rounded-lg px-4 py-2 focus:outline-none focus:ring-2 focus:ring-blue-500" placeholder="Default focus" />
<input class="w-full border border-green-300 rounded-lg px-4 py-2 ring-2 ring-green-400" placeholder="Success state" />
<input class="w-full border border-red-300 rounded-lg px-4 py-2 ring-2 ring-red-400" placeholder="Error state" />
</div>ring-offset and ring-offset-color
ring-offset-* adds white space between the element's border and the ring, making the ring visually distinct from the element itself. ring-offset-2 is the most common value, creating a 2px gap. By default the offset is white — on colored backgrounds, match it with ring-offset-blue-600 to fill the gap with the background color instead of white, maintaining the visual separation.
<!-- ring-offset creating visual separation -->
<div class="flex gap-4 items-center p-6">
<!-- On white: default white offset looks great -->
<button class="bg-blue-500 text-white px-4 py-2 rounded-lg ring-2 ring-blue-500 ring-offset-2">
White bg offset
</button>
<!-- On colored bg: match offset to background -->
<div class="bg-blue-600 p-4 rounded-xl">
<button class="bg-white text-blue-600 px-4 py-2 rounded-lg ring-2 ring-white ring-offset-2 ring-offset-blue-600">
Colored bg offset
</button>
</div>
</div>ring-inset for Inner Rings
ring-inset draws the ring on the inside of the element instead of the outside, similar to shadow-inner. This is useful when an outer ring would conflict with adjacent elements or overflow a clipped container. Inner rings are also visually distinct — they convey a selected or active state rather than a focused state, making them useful for toggle components and active tabs.
<!-- Inner ring for active/selected states -->
<div class="flex gap-3">
<!-- Selected card with inner ring -->
<div class="bg-blue-50 border border-blue-200 rounded-xl p-4 ring-2 ring-inset ring-blue-500 cursor-pointer">
<div class="font-semibold text-blue-700">Basic Plan</div>
<div class="text-sm text-blue-600">$9/month</div>
</div>
<!-- Unselected card -->
<div class="bg-white border border-gray-200 rounded-xl p-4 cursor-pointer hover:border-gray-300">
<div class="font-semibold">Pro Plan</div>
<div class="text-sm text-gray-500">$29/month</div>
</div>
</div>The outline-* Utilities
Tailwind also provides utilities for the CSS outline property. While rings are usually preferred for focus styles, native outlines have one unique advantage: they are not affected by overflow-hidden — they render outside clipped containers. outline-none removes the browser default, while outline, outline-2, and outline-dashed add styled outlines.
<!-- outline utilities -->
<div class="space-y-3 max-w-xs">
<!-- Remove default outline (bad practice alone!) -->
<button class="w-full bg-gray-200 p-2 rounded focus:outline-none">outline-none (no focus!)</button>
<!-- Custom outline -->
<button class="w-full bg-gray-200 p-2 rounded outline outline-2 outline-blue-500">
outline-2 outline-blue-500
</button>
<!-- Dashed outline -->
<button class="w-full bg-gray-200 p-2 rounded outline outline-dashed outline-2 outline-gray-400">
outline-dashed
</button>
</div>outline-offset Utility
outline-offset-* controls the gap between the element's border and its outline, just like ring-offset-* does for rings. Positive values push the outline outward, negative values draw it inward. This utility is useful for creating distinctive focus styles that maintain spacing from the element's edge without affecting layout (outlines are layout-inert in CSS).
<!-- outline-offset creates space between element and outline -->
<div class="flex gap-6 p-6">
<button class="bg-blue-500 text-white px-4 py-2 rounded outline outline-2 outline-blue-500 outline-offset-0">
offset-0
</button>
<button class="bg-blue-500 text-white px-4 py-2 rounded outline outline-2 outline-blue-500 outline-offset-2">
offset-2
</button>
<button class="bg-blue-500 text-white px-4 py-2 rounded outline outline-2 outline-blue-500 outline-offset-4">
offset-4
</button>
</div>Best Practice: focus-visible Variant
The focus-visible:ring-* pattern shows focus rings only for keyboard navigation, not mouse clicks. This resolves the UX conflict between designers (who dislike visible rings on mouse clicks) and accessibility requirements (which require visible focus for keyboard users). Always prefer focus-visible:ring-2 over focus:ring-2 in modern Tailwind projects.
<!-- focus-visible: best practice for modern a11y -->
<div class="flex gap-4">
<!-- Ring shows for keyboard, hidden for mouse -->
<button class="bg-blue-500 text-white px-4 py-2 rounded-lg focus:outline-none focus-visible:ring-2 focus-visible:ring-blue-500 focus-visible:ring-offset-2">
Smart Focus Ring
</button>
<!-- Compare: always visible on any focus -->
<button class="bg-gray-500 text-white px-4 py-2 rounded-lg focus:outline-none focus:ring-2 focus:ring-gray-500 focus:ring-offset-2">
Always Visible Ring
</button>
</div>Rings in Interactive Components
Rings shine in complex interactive patterns. Checkbox and radio button custom implementations, multi-select tags, and color pickers all use rings to show selection state clearly. Here is a color picker pattern where the selected swatch shows an inset ring indicator — a common pattern in color palette selectors and theme pickers.
<!-- Color picker with ring-based selection indicator -->
<div class="flex gap-3">
<!-- Selected: shows inset ring -->
<button class="w-10 h-10 rounded-full bg-blue-500 ring-2 ring-blue-500 ring-offset-2" aria-label="Blue (selected)"></button>
<!-- Unselected swatches -->
<button class="w-10 h-10 rounded-full bg-purple-500 hover:ring-2 hover:ring-purple-500 hover:ring-offset-2 transition-all" aria-label="Purple"></button>
<button class="w-10 h-10 rounded-full bg-green-500 hover:ring-2 hover:ring-green-500 hover:ring-offset-2 transition-all" aria-label="Green"></button>
<button class="w-10 h-10 rounded-full bg-red-500 hover:ring-2 hover:ring-red-500 hover:ring-offset-2 transition-all" aria-label="Red"></button>
</div>Combining Ring, Shadow, and Border
Since rings are implemented with box-shadow, you can combine them with Tailwind's other shadow utilities by listing both the shadow and ring classes. The box-shadow property stacks multiple values. This allows a card to have an elevation shadow and a focus ring simultaneously, ensuring the interactive affordance does not eliminate the visual depth.
<!-- Card that keeps its shadow AND gets a ring on focus -->
<div class="p-6">
<button class="w-full text-left bg-white rounded-xl shadow-md border border-gray-200 p-5 focus:outline-none focus-visible:ring-2 focus-visible:ring-blue-500 focus-visible:ring-offset-2 hover:shadow-lg transition-shadow">
<h3 class="font-bold">Clickable Card</h3>
<p class="text-gray-500 text-sm mt-1">Has shadow + focus ring when keyboard focused.</p>
</button>
</div>Quick Check
Test your understanding of Tailwind CSS Mastery concepts from this lesson.
Lesson Recap
In this lesson you learned: ring-* utilities create accessible focus indicators using box-shadow without affecting layout, ring-offset-* adds visual separation between the element and its focus ring, and focus-visible:ring-* is the modern best practice that shows rings for keyboard users only. Next up we explore hover and active state variants for interactive styling.
よくある質問
「アウトラインとリングのユーティリティ」レッスンは無料ですか？
はい。「アウトラインとリングのユーティリティ」の完全なテキストはこのウェブで無料で読めます。インタラクティブに演習し（組み込みコードエディタと24時間対応のAIチューター）、Tailwind CSS Academyコースの残りをアンロックするには、CoddyKit PROにアップグレードしてください。 Tailwind CSS Academyコースには全4レッスンが含まれています。
「アウトラインとリングのユーティリティ」で何を学びますか？
ring-*ユーティリティを使ってアクセシブルなフォーカスインジケーターを追加します。要素の外側に描画されるため、レイアウトに影響しません。 ブラウザで直接実行するハンズオンコードでTailwind CSS Academyを演習し、24時間対応のAIチューターがレッスンを進める中での質問に答えます。
Tailwind CSS Academyを始めるのに経験は必要ですか？
事前経験は必要ありません。CoddyKitのTailwind CSS Academyは初級者から上級者向けに構成されているため、ここから始めるか最初から始めて、自分のペースで進むことができます。 これはレッスン4/4です。
「アウトラインとリングのユーティリティ」レッスンにはどのくらい時間がかかりますか？
ほとんどのCoddyKitレッスンは約5～10分かかります。各レッスンはコンパクトでインタラクティブなので、着実に進歩し、ウェブとアプリ全体で正確に前回の場所から再開できます。
このTailwind CSS Academyレッスンでコードを書いて実行できますか？
はい。すべてのTailwind CSS Academyレッスンに組み込みコードエディタが含まれているため、ブラウザでリアルコードを書いて実行し、即座のAIフィードバックを取得できます。ローカル設定は不要です。
このコースのすべてのレッスン
- ボーダーの幅と色
- ボーダーの半径と角丸
- ボックスシャドウ
- アウトラインとリングのユーティリティ