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How to define a measurement in screen pixels with CSS?
To define a measurement in screen pixels with CSS, use the px unit. The pixel (px) is an absolute unit that represents a single dot on the screen and provides precise control over element sizing and positioning.
Syntax
property: value px;
Example: Using Pixels for Positioning and Sizing
<html>
<head>
<style>
.pixel-example {
position: relative;
left: 90px;
top: 30px;
width: 200px;
height: 100px;
background-color: yellow;
border: 2px solid blue;
padding: 15px;
margin: 20px;
}
</style>
</head>
<body>
<div class="pixel-example">
This div uses pixel measurements for positioning, size, border, padding, and margin.
</div>
</body>
</html>
Common Properties Using Pixels
<html>
<head>
<style>
.text-example {
font-size: 16px;
line-height: 24px;
letter-spacing: 2px;
text-indent: 30px;
}
.box-example {
width: 250px;
height: 150px;
border-radius: 10px;
box-shadow: 5px 5px 10px gray;
}
</style>
</head>
<body>
<p class="text-example">
This text uses pixel measurements for font size, line height, and spacing.
</p>
<div class="box-example" style="background-color: lightblue;">
This box uses pixels for dimensions and styling.
</div>
</body>
</html>
Key Points
- Absolute Unit: Pixels provide fixed measurements that don't change with screen size
- Precise Control: Ideal for borders, margins, and exact positioning
- Cross-Browser: Universally supported across all browsers
- Screen Dependent: Actual size may vary on different display densities
Conclusion
The px unit is the most common way to define precise measurements in CSS. Use pixels when you need exact control over element dimensions and positioning, especially for UI components and layout structure.
Updated on: 2026-03-15T23:18:59+05:30
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