CSS Units
When working with CSS, you can control the size of elements using a variety of units. Understanding the difference between absolute and relative units is essential for creating flexible and accessible layouts.
Absolute units, such as px (pixels), have a fixed size. Using px means the element will always appear the same size regardless of its parent or the user's browser settings. This is useful when you want precise control over spacing or when designing elements that must stay the same size across devices.
Relative units adapt based on other measurements:
emis relative to the font size of the element's parent. If the parent has afont-sizeof20px, then1emequals20pxin that context;remis relative to the root element's (<html>) font size. If the root font size is16px, then1remis always16px, no matter where it is used;%is relative to the size of the parent element. For width and height, this means the element will scale as its container changes size.
Choosing between these units depends on your layout needs:
- Use
pxfor elements that must remain a specific size; - Use
emor%for components that should scale with their parent; - Use
remto ensure consistent sizing across the page, especially for typography.
Relative units are especially helpful for responsive design, where you want elements to adjust smoothly to different screen sizes or user settings. Understanding how each unit works allows you to build layouts that are both flexible and predictable.
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Can you give examples of when to use each unit in a real project?
How do I choose between em and rem for font sizes?
Are there other CSS units I should know about?
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When working with CSS, you can control the size of elements using a variety of units. Understanding the difference between absolute and relative units is essential for creating flexible and accessible layouts.
Absolute units, such as px (pixels), have a fixed size. Using px means the element will always appear the same size regardless of its parent or the user's browser settings. This is useful when you want precise control over spacing or when designing elements that must stay the same size across devices.
Relative units adapt based on other measurements:
emis relative to the font size of the element's parent. If the parent has afont-sizeof20px, then1emequals20pxin that context;remis relative to the root element's (<html>) font size. If the root font size is16px, then1remis always16px, no matter where it is used;%is relative to the size of the parent element. For width and height, this means the element will scale as its container changes size.
Choosing between these units depends on your layout needs:
- Use
pxfor elements that must remain a specific size; - Use
emor%for components that should scale with their parent; - Use
remto ensure consistent sizing across the page, especially for typography.
Relative units are especially helpful for responsive design, where you want elements to adjust smoothly to different screen sizes or user settings. Understanding how each unit works allows you to build layouts that are both flexible and predictable.
index.html
style.css
Danke für Ihr Feedback!
