The CSS border-bottom-color property is used to specify the color of an element's bottom border. It is always necessary to declare the border-style or border-bottom-style property before using the border-bottom-color property because a border must exist before we can change its color .
The color of the bottom border is specified here. For a complete list of color values, see CSS color Values. The default color is the element's current color . Indicates that the border color should be transparent.
transparent
This property is set to its default value.
initial
This property is inherited from its parent element.