Question
Answer and Explanation
The CSS property border-radius is indeed used to create rounded corners on elements, and when applied to images, it can make them appear as ovals or circles, depending on the values you use and the aspect ratio of the image.
Here’s how it works:
1. Equal values create a circle or ellipse: When all four border-radius values are equal (e.g., border-radius: 50% or border-radius: 100px), the result will be a perfect circle if the element has a square shape. If it's a rectangle, the result will be an oval.
2. Using percentages: A percentage value, like 50%, computes relative to the corresponding dimension (width for horizontal radius, height for vertical radius). For an oval, the horizontal and vertical radii are unequal.
3. Non-equal values create various shapes: If different values are provided, such as border-radius: 20px 40px 10px 5px;, you can create complex shapes including rounded rectangles and a variety of oval-like corners.
4. Rectangle to Oval: An image with an inherent rectangular shape, and an equal border-radius value, will create an oval. This is because it creates a circle that tries to fit into the rectangular shape.
5. Square to Circle: To get a perfect circle, make sure the element has a square shape first (e.g. use padding to make image a square), and then use border-radius: 50%;.
6. Image Dimensions: If the image isn't already a square, setting border-radius: 50% will create an oval. The oval will be determined by the dimensions of the rectangle.
For example, if your image has a width of 200px and height of 100px and you apply border-radius: 50%;, the rounded corners will turn your rectangle into an oval instead of a circle.
So, in summary, using border-radius can make an image appear as an oval by creating rounded corners that fit into the shape of the image. If you intend to create a perfect circle, you need to work with a square, or force the aspect ratio of the image to be 1:1 using CSS properties, such as padding-bottom.