Usage of border-bottom-color property in CSS

The border-bottom-color CSS property sets the color of an element's bottom border. It only affects the color when a border style is already defined.

Syntax

border-bottom-color: color | transparent | inherit;

Parameters

The property accepts these values:

  • color - Any valid CSS color value (hex, RGB, named colors)
  • transparent - Makes the border invisible
  • inherit - Inherits the color from parent element

Example: Basic Usage

<html>
    <head>
        <style>
            p.demo {
                border: 3px solid;
                border-bottom-color: #FF0000;
                padding: 10px;
            }
        </style>
    </head>
    <body>
        <p class="demo">
            This paragraph has a red bottom border
        </p>
    </body>
</html>

Example: Multiple Color Values

<html>
    <head>
        <style>
            .box1 {
                border: 2px solid;
                border-bottom-color: blue;
                padding: 10px;
                margin: 10px 0;
            }
            
            .box2 {
                border: 3px solid;
                border-bottom-color: rgb(255, 165, 0);
                padding: 10px;
                margin: 10px 0;
            }
            
            .box3 {
                border: 4px solid;
                border-bottom-color: transparent;
                padding: 10px;
                margin: 10px 0;
            }
        </style>
    </head>
    <body>
        <div class="box1">Blue bottom border</div>
        <div class="box2">Orange bottom border (RGB)</div>
        <div class="box3">Transparent bottom border</div>
    </body>
</html>

Key Points

  • The border-bottom-color property only works when a border style is defined
  • If no border style exists, the color property has no visible effect
  • This property only affects the bottom border, leaving other borders unchanged
  • Works with all CSS color formats: hex (#FF0000), RGB, HSL, and named colors

Conclusion

The border-bottom-color property provides precise control over bottom border colors. Always ensure a border style is defined first, then apply the desired color using any valid CSS color value.

Updated on: 2026-03-15T23:18:59+05:30

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