The Divider block is a customizable wrapper around an <hr>
element.
Programmatic Usage
The divider can be customized with the following properties (view the Divider Block entity type to see these in context):
Its width is set to 100% and its border to "none", allowing the Height In Pixels
property to control the line's thickness. The CSS Background Color
property sets the element's background color.
By default, the line will be 1px thick and black.