Justifier le contenu et aligner les éléments
Positionnez les éléments enfants sur l’axe principal avec justify-* et sur l’axe transversal avec items-* afin d’obtenir les dispositions courantes.
Justifier le contenu et aligner les éléments est une leçon Tailwind CSS Academy gratuite sur CoddyKit. Ceci est la leçon 2 sur 4. Tu peux lire la leçon complète ci-dessous gratuitement — puis la pratiquer en direct dans le navigateur avec un éditeur de code intégré et un tuteur IA 24/7. Elle fait partie du parcours d'apprentissage Tailwind CSS Academy, et ta progression se synchronise sur le web et l'application CoddyKit. Le cours Tailwind CSS Academy comprend 4 leçons au total.
Certaines parties de cette leçon n'ont pas encore été traduites et s'affichent en anglais.
Two Axes of Flex Alignment
Flexbox alignment operates on two perpendicular axes. The main axis runs in the direction of flex-row (horizontal) or flex-col (vertical). The cross axis is perpendicular to the main axis. justify-* controls alignment along the main axis. items-* controls alignment along the cross axis. Understanding this distinction is the key to mastering flex layout.
justify-content: Main Axis Positioning
The justify-* utilities correspond to CSS justify-content. In a flex row, they control horizontal positioning of the group of items. justify-start packs items to the left (default). justify-end packs to the right. justify-center centers the group. justify-between distributes items with equal space between them. justify-around adds equal space around each item. justify-evenly distributes space evenly including the edges.
<div class="flex justify-start gap-2 bg-gray-100 p-4 mb-2"><div class="bg-blue-400 p-3">A</div><div class="bg-blue-400 p-3">B</div></div>
<div class="flex justify-center gap-2 bg-gray-100 p-4 mb-2"><div class="bg-blue-400 p-3">A</div><div class="bg-blue-400 p-3">B</div></div>
<div class="flex justify-between bg-gray-100 p-4 mb-2"><div class="bg-blue-400 p-3">A</div><div class="bg-blue-400 p-3">B</div></div>
<div class="flex justify-end gap-2 bg-gray-100 p-4"><div class="bg-blue-400 p-3">A</div><div class="bg-blue-400 p-3">B</div></div>justify-between: The Space Distributor
justify-between is one of the most used flex utilities. It places the first item at the start of the container, the last item at the end, and distributes remaining items with equal space between them. This is the standard pattern for navbars (logo left, links right), cards (icon left, action right), and any component where items should occupy the full width with space between.
<!-- Navbar with justify-between -->
<div class="flex items-center justify-between px-6 py-4 bg-white shadow">
<span class="font-bold text-indigo-600">Logo</span>
<button class="bg-indigo-600 text-white text-sm px-4 py-2 rounded">Sign Up</button>
</div>
<!-- Card footer with actions -->
<div class="flex items-center justify-between pt-4 border-t">
<span class="text-sm text-gray-500">Last updated: Today</span>
<button class="text-indigo-600 text-sm font-medium">Edit</button>
</div>align-items: Cross Axis Positioning
The items-* utilities correspond to CSS align-items and control how items are positioned on the cross axis. In a flex row, this controls vertical alignment. items-start aligns to the top. items-end aligns to the bottom. items-center vertically centers all items. items-stretch (default) stretches items to fill the container's height. items-baseline aligns text baselines.
<!-- All four items-* values demonstrated in a row -->
<div class="flex items-start h-24 gap-4 bg-gray-100 p-4 mb-2">
<div class="bg-blue-400 p-2 text-sm">Start</div>
</div>
<div class="flex items-center h-24 gap-4 bg-gray-100 p-4 mb-2">
<div class="bg-green-400 p-2 text-sm">Center</div>
</div>
<div class="flex items-end h-24 gap-4 bg-gray-100 p-4">
<div class="bg-red-400 p-2 text-sm">End</div>
</div>items-center: The Most Used Alignment
items-center is used in virtually every flex row because it vertically centers all children regardless of their individual heights. Icons, text, and buttons — even when they differ in size — all align along their vertical midpoints. This makes navbars, list items, and card footers look polished without any manual height adjustments.
<!-- Icon + text + badge: all different heights, all centered -->
<div class="flex items-center gap-3 px-4 py-3 hover:bg-gray-50">
<div class="w-10 h-10 bg-indigo-100 rounded-full flex items-center justify-center text-indigo-600 font-bold">
JD
</div>
<div>
<p class="font-medium text-gray-900">Jane Doe</p>
<p class="text-xs text-gray-500">Product Designer</p>
</div>
<span class="ml-auto bg-green-100 text-green-700 text-xs font-semibold px-2 py-0.5 rounded-full">
Active
</span>
</div>items-baseline for Text Alignment
items-baseline aligns items so that their text baselines (the bottom of capital letters) line up. This is useful when mixing different font sizes in a row — for example, a large price number next to a smaller currency symbol or unit label. Without baseline alignment, the different sizes look awkward; with it, they form a visually cohesive group.
<!-- Price with currency and period aligned on baseline -->
<div class="flex items-baseline gap-1">
<span class="text-sm font-medium text-gray-500">$</span>
<span class="text-4xl font-extrabold text-gray-900">49</span>
<span class="text-sm font-medium text-gray-500">/month</span>
</div>Combining justify and items
Power comes from combining justify-* and items-* together. The classic flex items-center justify-center centers content on both axes simultaneously. flex items-center justify-between distributes items horizontally while keeping them vertically centered — the standard navbar pattern. Think of it as controlling two independent axes at once.
<!-- Perfect vertical and horizontal centering -->
<div class="min-h-screen flex items-center justify-center">
<p class="text-2xl font-bold">Dead center</p>
</div>
<!-- Navbar pattern -->
<nav class="flex items-center justify-between px-8 h-16 bg-white border-b">
<span class="font-bold">Brand</span>
<button class="text-sm font-medium text-indigo-600">Login</button>
</nav>align-self: Individual Item Override
While items-* aligns all children uniformly, self-* utilities override alignment for a single flex item. self-start, self-end, self-center, self-stretch, and self-baseline work exactly like their items-* counterparts but apply to the element they are written on rather than all children. Use this to break one item out of the group's alignment.
<!-- Most items centered, but one aligned to the top -->
<div class="flex items-center gap-4 bg-gray-100 p-4 h-24">
<div class="self-start bg-indigo-400 p-3">Top</div>
<div class="bg-green-400 p-3">Middle</div>
<div class="bg-blue-400 p-3">Middle</div>
</div>justify-items in Grid (not Flex)
Do not confuse justify-content (for flex containers) with justify-items (for grid containers). In Tailwind, justify-* controls justify-content on flex containers. For CSS Grid, you use justify-items-* and place-items-*. These control how grid children are positioned within their individual grid cells rather than how the grid tracks are distributed.
<!-- Flex: justify-between distributes the group -->
<div class="flex justify-between">
<div>A</div><div>B</div><div>C</div>
</div>
<!-- Grid: justify-items centers each item within its cell -->
<div class="grid grid-cols-3 justify-items-center">
<div>A</div><div>B</div><div>C</div>
</div>align-content for Multi-Line Flex
When flex items wrap across multiple lines (using flex-wrap), content-* utilities control alignment of the entire group of lines. content-center centers all lines as a group in the container. content-between distributes lines with space between them. This operates on the collection of rows (or columns), not individual items.
<!-- Multi-line flex with content alignment -->
<div class="flex flex-wrap content-center gap-4 bg-gray-100 h-64 p-4">
<div class="bg-blue-400 p-4 rounded">A</div>
<div class="bg-blue-400 p-4 rounded">B</div>
<div class="bg-blue-400 p-4 rounded">C</div>
<div class="bg-blue-400 p-4 rounded">D</div>
<div class="bg-blue-400 p-4 rounded">E</div>
</div>Practical: Feature Card Row
A feature card row commonly uses flex items-start (to let variable-height cards align from the top) combined with gap-6. Each card internally uses flex flex-col so that a 'Learn More' link at the bottom can be pushed there with mt-auto. This combination creates a professional feature grid where all cards start at the same vertical position.
<div class="flex items-start gap-6">
<div class="flex flex-col flex-1 bg-white rounded-xl p-6 shadow">
<div class="w-10 h-10 bg-indigo-100 rounded-lg mb-4"></div>
<h3 class="font-bold text-gray-900 mb-2">Fast</h3>
<p class="text-gray-500 text-sm flex-1">Lightning-fast builds with the JIT engine.</p>
<a href="#" class="mt-4 text-indigo-600 text-sm font-medium">Learn more →</a>
</div>
<div class="flex flex-col flex-1 bg-white rounded-xl p-6 shadow">
<div class="w-10 h-10 bg-green-100 rounded-lg mb-4"></div>
<h3 class="font-bold text-gray-900 mb-2">Flexible</h3>
<p class="text-gray-500 text-sm flex-1">Customize every aspect with the config.</p>
<a href="#" class="mt-4 text-green-600 text-sm font-medium">Learn more →</a>
</div>
</div>Quick Check
Test your understanding of Tailwind CSS Mastery concepts from this lesson.
Lesson Recap
In this lesson you learned: justify-* controls main axis alignment (horizontal in flex-row), items-* controls cross axis alignment (vertical in flex-row), and combining flex items-center justify-between is the standard navbar pattern. Next up we control how flex children grow and shrink with flex-grow, flex-shrink, and basis utilities.
Questions Fréquemment Posées
La leçon « Justifier le contenu et aligner les éléments » est-elle gratuite ?
Oui — le texte complet de « Justifier le contenu et aligner les éléments » est gratuit à lire ici sur le web. Pour la pratiquer de manière interactive (un éditeur de code intégré et un tuteur IA 24/7) et déverrouiller le reste du cours Tailwind CSS Academy, passe à CoddyKit PRO. Le cours Tailwind CSS Academy comprend 4 leçons au total.
Qu'est-ce que j'apprendrai dans « Justifier le contenu et aligner les éléments » ?
Positionnez les éléments enfants sur l’axe principal avec justify-* et sur l’axe transversal avec items-* afin d’obtenir les dispositions courantes. Tu pratiques Tailwind CSS Academy avec du code pratique que tu exécutes directement dans le navigateur, et un tuteur IA 24/7 répond à tes questions au fur et à mesure que tu avances dans la leçon.
Dois-je avoir de l'expérience pour commencer Tailwind CSS Academy ?
Aucune expérience préalable n'est requise. Tailwind CSS Academy sur CoddyKit est structuré pour les débutants jusqu'aux apprenants avancés, donc tu peux commencer ici ou depuis le début et avancer à ton rythme. Ceci est la leçon 2 sur 4.
Combien de temps prend la leçon « Justifier le contenu et aligner les éléments » ?
La plupart des leçons CoddyKit prennent environ 5–10 minutes. Chacune est courte et interactive, tu progresses régulièrement et tu repiques exactement où tu t'es arrêté sur le web et l'app.
Peux-tu écrire et exécuter du code dans cette leçon Tailwind CSS Academy ?
Oui. Chaque leçon Tailwind CSS Academy inclut un éditeur de code intégré, tu écris et exécutes du vrai code directement dans ton navigateur et tu reçois des retours IA instantanés — aucune configuration locale requise.
Toutes les leçons de ce cours
- Activer Flex et choisir la direction
- Justifier le contenu et aligner les éléments
- Extension, réduction et base Flex
- Retour à la ligne et espacement