How Can I Customize Underline Length and Position Using CSS Gradients?

Styling Underlines: Controlling Length and Position

Underlines are commonly used to emphasize text. However, they往往 are confined to a fixed length and position, leaving limits on customization. This guide explores how to alter the length and position of underlines using CSS gradients.

Using Gradients

Gradients provide a flexible way to manipulate underlines. By using a background gradient, you can adjust both the size and position of the underlined portion.

.underline {
  background-image: linear-gradient(#5fca66 0 0);
  background-position: bottom center; /* Adjust position */
  background-size: 80% 2px; /* Control length and height */
  background-repeat: no-repeat;
  padding-bottom: 4px; /* Can also affect position */
}

Adjusting Length and Position

By modifying the background-size property, you can control the length and height of the underline. For example:

.small {
  background-size: 50% 1px;
}

.big {
  background-size: 100% 3px;
}

To reposition the underline, adjust the background-position property. For instance:

.left {
  background-position: bottom left;
}

.center-close {
  background-position: bottom 5px center;
}

.right {
  background-position: bottom right;
}

Additional Controls

The padding-bottom property can also be used to fine-tune the position of the underline, particularly when used in conjunction with the background-position property.

.close {
  padding-bottom: 0;
  background-position: bottom 5px center;
}

.far {
  padding-bottom: 10px;
}

Example

<span class="underline">This is a sentence</span>. I would like <span class="underline close">some words to have</span> longer <span class="underline left">underlines</span> than others. I would <span class="underline big center-close">also like</span> to be able to change the <span class="underline small right">position</span> of the <span class="underline big">underline</span>(to
<span class="underline far">be centered under the word, for example</span>).

This example demonstrates the various length and position adjustments made possible by CSS gradients.

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