The blur-radius value determines the
degree of blurriness in the shadow.
It is an optional property.
If the blur-radius value is not
specified, it defaults to 0.
Let's look at an example:
In the above example, we added blur radius
with varying values to the elements.
The .no-blur-shadow box demonstrates a shadow
without blur, while the .with-blur-shadow box
applies a blur radius of 10px.
The .high-blur-shadow and .low-blur-shadow boxes have
blur radius of 15px and 10px, respectively.