In CSS, the border property allows us to set the width and color of the border around an element.
The outline property allows us to set the thickness of a line that is drawn around an element.
The CSS border property is used to define an element's border properties. The CSS outline, on the other hand, does not take up any space and, if enabled, is displayed around the border. It accepts offset. Furthermore, we are unable to specify whether or not individual sides should be outlined.
The width, line style, and colour of an element's outline are defined by the CSS outline property. It's a shorthand property for the CSS attributes outline-width, outline-style, and outline-color.
The border of an element is formed within it, whereas the outline is created outside of it. As a result, the border is calculated using the element's width and height, while the outline draws outside the element.