CSS 101: The Essentials of Styling Link Underlines

A finger touching a laptop screen with glowing code

By default, HTML anchors are visually distinguished to signal their interactive nature, often presented with an underline and a blue hue, changing to a cursor pointer upon mouseover. This discussion is dedicated to text-based hyperlinks, detailing strategies to craft underlines. The spotlight is on three distinct approaches:

  • Text decoration;
  • Border;
  • Box shadow.

Understanding the essentials of styling link underlines in CSS sets the stage for more advanced techniques like replicating CSS styles from existing websites.

Styling with Text Decoration

Utilizing the text-decoration property is the most straightforward method to stylize links. 

  • This property is shorthand for applying various decorative effects to text, such as lines, color, and style;
  • It encompasses the text-decoration-line, text-decoration-color, and text-decoration-style properties and accepts between one to three values to define these aspects comprehensively.
a {
  text-decoration: underline;
}

Expand your array of distinctive styles by incorporating the color and style properties.

a {
  text-decoration: underline dotted #da28e0;
}

The underline styles at your disposal include:

solid;
double;
dotted;
dashed;
wavy.

To define the distance between the underline and text, employ the text-underline-offset property.

a {
  text-underline-offset: 5px;
}

Utilize the text-decoration-thickness property within the text-decoration to establish the width or thickness of the underline.

a {
  text-decoration-line: underline;
  text-decoration-thickness: 5px;
}

Ultimately, the text-decoration property lends itself to animation. For instance, you can create a hover effect that conceals an underline using a transition.

a {
    text-decoration: underline solid currentColor;
    transition: text-decoration-color .2s ease-in-out;
}

a:hover {
  text-decoration-color: transparent;
}

Utilizing Borders for Underlines

A dark screen displaying coding software with text and symbols

The border-bottom property is an alternative to create distinctive link underlines. It’s essential to disable the default text-decoration first to prevent overlapping underlines.

a {
  text-decoration: none;
  border-bottom: 1px dashed #da28e0;
}

Similar to text-decoration, you have control over the underline’s width, color, and styles through properties exclusive to the border, such as:

dotted;
dashed;
solid;
double;
groove;
ridge;
inset;
outset.

To manage the gap between the text and the underline, incorporate the padding property.

a {
  text-decoration: none;
  border-bottom: 1px dashed #da28e0;
  padding-bottom: 5px; 
}

For distinctive and stylish underlines, consider applying gradient colors. Utilize the border-image property to set gradient colors for the border.

a {
  text-decoration: none;
  border-bottom: 3px solid;
  border-image: linear-gradient(45deg, purple, orange) 1;
}

Styling with Box Shadow

The box-shadow property offers another creative approach to crafting underlines for links. Similar to using borders, it’s important to remove the default underline with text-decoration: none to prevent redundancy.

a {
  text-decoration: none;
  box-shadow: 0 2px #da28e0;
  padding-bottom: 3px;
}

Beyond width and spacing, box-shadow can manipulate blur and spread radius, enabling the creation of unique effects such as glows or soft shadows around the underline.

a {
  text-decoration: none;
  box-shadow: 0 5px 4px -3px #047cea;
}

These additional properties can be tuned to produce underlines that not only stand out visually but also add a layer of depth and interactivity to web page elements.

Eliminating Link Underlines

Hands typing on a laptop with code and digital icons overlay

Alt: Hands typing on a laptop with code and digital icons overlay.

  • To eliminate underlines from links, the appropriate CSS properties must be overridden and set to ‘none’;
  • This may require resetting multiple properties, depending on the styling applied.

In environments with layered styling from multiple sources, like WordPress with its various themes and plugins, developers might need to address each method used to create underlines. Ensuring complete removal involves specifying ‘none’ for all potential underline properties:

a {
  text-decoration: none;
  border: none;
  box-shadow: none;
}

Conclusion

In conclusion, for customized underline styling beyond the default, leverage the border or box-shadow properties. These properties additionally enable the application of transitions, providing creative possibilities for hover effects.