This example shows how to create a three-column layout using CSS Flexbox, with 100px fixed on the left, 80px fixed on the right, adaptive in the middle, and all column contents are vertically centered. 1. The parent container sets display: flex to enable elastic layout; 2. The middle column uses flex: 1 to occupy the remaining space; 3. Each child achieves text centering through align-items: center and justify-content: center; 4. Fixed width and flex: 1 to achieve flexible layout; this method simplifies the complexity of traditional floating or positioning, is suitable for responsive design, and can be easily expanded into equal distribution, reverse arrangement or vertical arrangement, fully realizing the efficiency and maintainability of modern web layouts.
Here is a practical CSS Flexbox example suitable for beginners to understand the basic usage of Flexbox. We will create a common layout: a three-column isowidth layout, adaptive in the middle, fixed width on both sides, and vertically centered content .

? Sample Target
- Left side: Fixed 100px wide
- Middle: Adaptive remaining space
- Right: Fixed 80px wide
- All columns are highly consistent, and the text is vertically centered
? HTML structure
<div class="container"> <div class="left">Left</div> <div class="center">Intermediate (adaptive)</div> <div class="right">Right</div> </div>
? CSS style
.container { display: flex; /* Enable Flexbox */ height: 100vh; /* Full screen high, easy to observe the effect*/ font-family: Arial, sans-serif; } .left { width: 100px; background-color: #ffcc00; display: flex; align-items: center; justify-content: center; } .center { flex: 1; /* occupy the remaining available space*/ background-color: #66ccff; display: flex; align-items: center; justify-content: center; } .right { width: 80px; background-color: #cc66ff; display: flex; align-items: center; justify-content: center; }
? Key points description
1. display: flex
- Applies to the parent container (
.container
) to make the child elements become elastic items.
2. flex: 1
- Let the middle column automatically stretch and fill the remaining space.
- Equivalent to
flex-grow: 1
flex-shrink: 1
flex-basis: 0%
.
3. align-items: center
and justify-content: center
- Used to center the text within each box vertically and horizontally .
4. Fixed width adaptive combination
- Using
width
to set a fixed width,flex: 1
to achieve adaptability is a common layout technique.
? Common variants
Three equal columns (even distribution)
.left, .center, .right { flex: 1; /* per column is monospaced*/ }
Reverse arrangement (from right to left)
.container { flex-direction: row-reverse; }
Vertical layout (top to bottom)
.container { flex-direction: column; height: 400px; /* Set container height*/ }
Basically that's it. The advantages of Flexbox are that it is simple, responsive and has no calculation width , making it ideal for modern web layouts. This example covers the most commonly used properties that can be reused as templates.
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