How Can I Use CSS Border Radius to Create a Circle?

CSS Border Radius: Creating a Circle

Setting the Stage

Consider the following CSS snippet:

div {
    width: 0;
    height: 0;
    border: 180px solid red;
    border-radius: 180px;
}

Exploring the CSS Properties

Width and Height:
These properties set the content area to zero dimensions, meaning no visible rectangle is formed.

Border:
This property specifies a border of 180px width in all directions, even though the content area is zero-sized.

Border-Radius:
This property defines a rounded border with a radius of 180px. It applies to the outer edge of the border.

The End Result: A Circle

By combining these properties, the following visual effect is achieved:

• The zero-sized content area is not visible.
• The border forms a box with sides of 180px width due to the "solid" value in the "border" property.
• The "border-radius" property rounds the corners of the border, creating a circular outline.

As a result, the element appears as a filled circle with a radius of 180px.

Understanding the Application

This technique is often used to create rounded elements without having to rely on images. It is especially useful for creating circular elements, as illustrated in our example.

By controlling the values of "width," "height," "border," and "border-radius," designers can create borders with varying shapes and sizes to achieve different effects.

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