skew() is a CSS deformation function, used to tilt elements along the X-axis, Y-axis, or both at the same time; 1. skew(angleX) is only tilted along the X-axis, skew(angleX, angleY) is tilted along both axes at the same time; 2. In the example, transform: skew(20deg, 5deg) is triggered by hover to realize card tilt animation; 3. Pseudo-elements are used to tilt the background while the text remains forward; 4. Children elements can offset the parent tilt by reverse skew; 5. skew does not affect the document flow, and can adjust the tilt fulcrum with transform-origin. It is often used for visual enhancement, but excessive use should be avoided to affect readability.
CSS transform: skew()
is a very practical deformation function that allows elements to tilt along the X-axis, Y-axis, or both at the same time. It is often used to create bevel effects, dynamic buttons, background decorations, etc. The following is a simple but practical example to demonstrate the usage of skew
.

What is skew
?
skew(angleX, angleY)
accepts one or two angle parameters:
-
skew(30deg)
: tilt only along the X axis (horizontal) -
skew(30deg, 10deg)
: tilt 30° along the X axis and 10° on the Y axis - The unit is usually
deg
(degree)
Example: Create a tilted card
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <title>CSS Skew Example</title> <style> .container { display: flex; justify-content: center; align-items: center; height: 100vh; background: #f0f0f0; } .box { width: 200px; height: 100px; background: #3498db; color: white; display: flex; justify-content: center; align-items: center; font-family: sans-serif; border-radius: 8px; box-shadow: 0 4px 8px rgba(0,0,0,0.1); transition: transform 0.3s ease; } .box:hover { transform: skew(20deg, 5deg); } </style> </head> <body> <div class="container"> <div class="box">Hover me!</div> </div> </body> </html>
Effect description
- By default,
.box
is a blue rectangular card. - When the mouse is hovered (
:hover
), applytransform: skew(20deg, 5deg)
:- Inclined 20° along the X axis (looks to the right)
- Inclined 5° along the Y axis (slight upward twist)
- With
transition
, the tilt effect has smooth animation.
Common uses and tips
- Skew the background but the content is normal : Sometimes you just want the background to tilt, while the text stays positive. Pseudo-elements can be used:
.card { position: relative; color: white; z-index: 1; padding: 20px; } .card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: #e74c3c; transform: skew(-15deg); z-index: -1; border-radius: 8px; }
This way the background is tilted, the text will not be affected.

- Reverse skew fixes child elements :
.parent { transform: skewX(-20deg); } .child { transform: skewX(20deg); /* offset parent tilt and restore forward*/ }
This is useful when creating tilted navigation bars or banners.
Tips
-
skew
will change the visual shape of the element, but will not affect the document flow , and the layout will still occupy the placement according to the original rectangle. - Use
transform-origin
to adjust the tilt "fulcrum" position. - It is mostly used for visual enhancement to avoid excessive use affecting readability.
Basically that's it. skew
is not complicated, but it can add a lot of dynamic to the page if used properly.

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