CSS Rounded Corners allow developers to create elements with smooth, rounded edges using the border-radius property. This enhances the visual appeal of web components, making them appear more modern and sleek.

Basic Usage:

The border-radius property can be applied to any HTML element, and it accepts values in pixels, percentages, or ems. For example, border-radius: 10px; will round the corners of an element by 10 pixels.

Applying to Different Corners:

You can specify different values for each corner using the following syntax: border-radius: top-left top-right bottom-right bottom-left;. For instance, border-radius: 10px 20px 30px 40px; will apply different radii to each corner.

Creating Circles and Ellipses:

To create a perfect circle, set the border-radius to 50% on a square element. For ellipses, you can use two values: border-radius: 50% 25%;, which creates an ellipse with different horizontal and vertical radii.

Advanced Techniques:

CSS3 introduced the ability to use border-radius in conjunction with background images, allowing for complex designs where images can have rounded edges without additional image editing.

Browser Support:

Most modern browsers support the border-radius property. However, for older versions, vendor prefixes like -webkit- and -moz- might be necessary.


      .rounded-box {
        border-radius: 15px;
        background-color: #f0f0f0;
        width: 200px;
        height: 100px;
        text-align: center;
        line-height: 100px;
      }

Example Explanation:

In the above example, we have a simple box with a border-radius set to 15px, giving it rounded corners. The box is styled with a light gray background and centered text.

Practical Applications:

Rounded corners are widely used in UI design for buttons, cards, and containers to soften the appearance and improve user experience.

Responsive Design Considerations:

When designing for responsive layouts, using percentage values for border-radius ensures that elements scale appropriately across different screen sizes.

Combining with Other Properties:

Rounded corners can be combined with shadows, gradients, and animations to create visually appealing effects that enhance interactivity.

Accessibility Considerations:

While rounded corners are primarily aesthetic, ensuring that interactive elements remain clear and distinguishable is crucial for accessibility.

Further Exploration:

Experiment with different border-radius values and combinations to achieve unique designs and layouts that align with your brand's style.

Console Output:

[No console output for CSS styling]