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CSS Rounded Corners

CSS Rounded Corners allow you to apply rounded edges to elements using the border-radius property. This property is highly flexible and can be used to create shapes like circles, ellipses, or partially rounded elements.

Key Topics

Basic Usage of border-radius

The border-radius property allows you to round the corners of an element. You can specify a single value to apply uniform rounding to all corners, or multiple values to control each corner individually.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Basic border-radius</title>
    <style>
        .rounded-box {
            width: 200px;
            height: 100px;
            background-color: #007BFF;
            color: white;
            text-align: center;
            line-height: 100px;
            margin: 20px;
            border-radius: 15px;
        }
    </style>
</head>
<body>
    <div class="rounded-box">Rounded Corners</div>
</body>
</html>

Explanation: The border-radius: 15px; property rounds all corners of the element by 15 pixels.

Creating Circles and Ellipses

You can use border-radius to create perfect circles or ellipses by applying specific percentages.

<style>
        .circle {
            width: 100px;
            height: 100px;
            background-color: #28A745;
            color: white;
            text-align: center;
            line-height: 100px;
            border-radius: 50%;
        }
        .ellipse {
            width: 150px;
            height: 100px;
            background-color: #FFC107;
            color: black;
            text-align: center;
            line-height: 100px;
            border-radius: 50% / 25%;
        }
</style>
<div class="circle">Circle</div>
<div class="ellipse">Ellipse</div>

Explanation: The border-radius: 50%; creates a circle, while 50% / 25% creates an ellipse by applying different radii to the horizontal and vertical axes.

Partial Rounding

Partial rounding allows you to control individual corners using multiple values for border-radius.

<style>
        .partial-rounded {
            width: 200px;
            height: 100px;
            background-color: #DC3545;
            color: white;
            text-align: center;
            line-height: 100px;
            border-radius: 15px 50px 0 0;
        }
</style>
<div class="partial-rounded">Partial Rounding</div>

Explanation: The border-radius: 15px 50px 0 0; applies specific rounding values to each corner, starting from the top-left corner and proceeding clockwise.

Complete Example

This example demonstrates the different usages of border-radius in one layout:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Rounded Corners</title>
    <style>
        .rounded-box {
            width: 200px;
            height: 100px;
            background-color: #007BFF;
            color: white;
            text-align: center;
            line-height: 100px;
            border-radius: 15px;
            margin-bottom: 20px;
        }
        .circle {
            width: 100px;
            height: 100px;
            background-color: #28A745;
            color: white;
            text-align: center;
            line-height: 100px;
            border-radius: 50%;
            margin-bottom: 20px;
        }
        .ellipse {
            width: 150px;
            height: 100px;
            background-color: #FFC107;
            color: black;
            text-align: center;
            line-height: 100px;
            border-radius: 50% / 25%;
            margin-bottom: 20px;
        }
        .partial-rounded {
            width: 200px;
            height: 100px;
            background-color: #DC3545;
            color: white;
            text-align: center;
            line-height: 100px;
            border-radius: 15px 50px 0 0;
        }
    </style>
</head>
<body>
    <div class="rounded-box">Rounded Corners</div>
    <div class="circle">Circle</div>
    <div class="ellipse">Ellipse</div>
    <div class="partial-rounded">Partial Rounding</div>
</body>
</html>

Explanation: This example combines multiple uses of border-radius to demonstrate its flexibility and applications in web design.

Key Takeaways

  • Basic Rounding: Use border-radius with a single value for uniform rounding.
  • Circles and Ellipses: Achieve these shapes with percentages like 50% or 50% / 25%.
  • Partial Rounding: Specify values for individual corners for customized designs.
  • Flexibility: border-radius enables creative and visually appealing designs.
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