CSS Introduction

How to create text-fill animation using CSS ?

Last Updated : 15 Jul, 2025

A text-fill animation using CSS is a visual effect where the content of text gradually fills with a color, gradient, or pattern over time. This animation can create dynamic, eye-catching effects for headings or titles by adjusting properties like background-size, clip-path, or keyframe animations.

Approach:

Position Text: Use absolute positioning to center the text vertically and horizontally on the page.
Create Overlay: The ::before pseudo-element overlays the original text with a different color.
Text Content: Use content: attr(data-text) to duplicate the original text for the overlay effect.
Hidden Overlay: Initially, set the overlay's width to 0% for a hidden state.
Reveal on Hover: Increase the overlay's width to 100% on hover using a smooth transition.

Example: Here we are following the above-explained approach.

html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content=
        "width=device-width, initial-scale=1.0" />
    <title>Text Fill</title>

    <style>
        h1 {
            margin: 0;
            padding: 0;
            position: absolute;
            top: 50%;
            left: 50%;
            font-size: 5em;
            color: #ccc;
        }

        h1::before {
            /* This will create the layer
               over original text*/
            content: attr(data-text);
            position: absolute;
            top: 0;
            left: 0;

            /* Setting different color than
               that of original text  */
            color: green;
            overflow: hidden;

            /* Setting width as 0*/
            width: 0%;
            transition: 1s;
        }

        h1:hover::before {

            /* Setting width to 100 on hover*/
            width: 100%;
        }
    </style>
</head>

<body>
    <h1 data-text="Geeks">Geeks</h1>
</body>

</html>

Output:

CSS Introduction

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