border-color

Sets the color of the border. The default value is the current element color.

border-color: <color>;

where <color> can be one of the following:

• Color keyword: red, transparent, darkblue
• Hexadecimal value: #FF0000
• RGB value: rgb(255, 0, 0)
• RGBA value: rgba(255, 0, 255, 0.3)
• HSL value: hsl(0, 100%, 50%)
• HSLA Value: hsla(180, 80%, 100%, 0.8)

Set border of the h1 element to be green, 3 pixels thick, and dotted:

h1 {
  border-color: green;
  border-width: 3px;
  border-style: dotted;
}

Set the top and bottom borders coral and the left and right borders beige:

h1 {
  border-color: coral beige;
}