Tag border-bottom-left-radius

🔹 CSS border-bottom-left-radius: Rounding the Bottom-Left Corner with Style

In modern web design, rounded corners add a sleek, polished look to UI elements. While the general border-radiusproperty rounds all corners, border-bottom-left-radius lets you target just the bottom-left corner for precise styling.

🧾 What is border-bottom-left-radius?

The border-bottom-left-radius property defines the radius of the curve applied to the bottom-left corner of an element’s border box. It controls how rounded or sharp that corner appears.

🧬 Syntax

selector {
  border-bottom-left-radius: <length> | <percentage>;
}
  • <length> — units like px, em, rem, vh, etc. (e.g., 15px)
  • <percentage> — percentage of the element’s corresponding box dimension (e.g., 50%)

You can specify one or two values:

  • One value: applies to both horizontal and vertical radius equally.
  • Two values: first value is horizontal radius, second is vertical radius.

🎯 Examples

1. Rounded bottom-left corner with fixed radius

div {
  border-bottom-left-radius: 20px;
}

Rounds the bottom-left corner with a 20px curve.

2. Elliptical radius with two values

button {
  border-bottom-left-radius: 30px 10px;
}

Makes the curve elliptical: 30px horizontal radius, 10px vertical radius.

3. Using percentage

.box {
  border-bottom-left-radius: 50%;
}

Creates a very rounded corner, often creating a quarter-circle curve depending on element size.

🔍 How It Works

  • The radius defines the size of the ellipse used to round the corner.
  • Larger radius values create more pronounced curves.
  • Percentages are relative to the dimensions of the box—horizontal radius relative to width, vertical radius to height.
  • Combining border-bottom-left-radius with other corner radius properties (border-top-left-radius, border-top-right-radius, border-bottom-right-radius) lets you craft complex shapes.

🛠️ Use Cases

  • Softening UI boxes: Rounded corners make containers feel more approachable.
  • Custom buttons: Rounded corners only on certain edges create unique button shapes.
  • Cards and modals: Different radius on corners add layered depth or style.
  • Chat bubbles: Use rounded bottom-left corner to style speech bubble tails.

✅ Best Practices

  • Keep border radius values balanced with overall design aesthetics.
  • Avoid overly large radii on very small elements to prevent layout issues.
  • Combine with shadows and borders for sophisticated effects.
  • Test across browsers—border-bottom-left-radius enjoys wide support in modern browsers.

🔚 Conclusion

The border-bottom-left-radius CSS property is a powerful tool for fine-tuning the visual style of your elements by rounding just the bottom-left corner. It adds versatility to your designs, allowing you to create distinctive, polished interfaces.