Why Do Transparent Borders Distort Linear Gradients, and How Can I Fix It?

Border Anomaly Over Gradients: Explained and Resolved

When applying a transparent border over an element featuring a linear-gradient background, unexpected behavior may arise. The left and right edges of the element exhibit distorted colors and appear flattened.

This effect stems from the border extending beyond the padding-box, where the linear-gradient repeats. The outer border area inherits the gradient colors, resulting in the anomalies witnessed on the left and right sides.

Solution: Employ Box-Shadow

To resolve this issue, consider utilizing a box-shadow:inset instead of a border. Box-shadows render within the padding-box, similar to backgrounds.

Modify the CSS as follows:

box-shadow: inset 0 0 0 10px rgba(0,0,0,0.2);
padding: 10px;

Explanation:

• Box-shadows occupy no spatial area, necessitating an increase in padding to compensate for the additional border-like effect.
• The inset keyword ensures the box-shadow remains within the padding-box, mirroring the desired appearance of a border.

Conclusion:

By comprehending the behavior of borders and gradients in relation to the padding-box, you can effectively resolve this anomalous effect and achieve the desired border-like appearance with a box-shadow.

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