This property controls the color of the top border of an element's rendering box. If no border-color is specified for an element's border, the value of the 'color' property is used instead.

div { border-right-color: green }
this is green

Possible Values
inherit: Explicitly sets the value of this property to that of the parent.
transparent: The border is transparent (with any accompanying 'border-width' thickness) - eg: elements below it shine through.
[color]: Sets the border to the indicated color value.

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