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How can I use CSS to create a smooth fade-in effect on page load?

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How can I use CSS to create a smooth fade-in effect on page load?

Asked on Jan 25, 2026

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To create a smooth fade-in effect on page load using CSS, you can utilize the `opacity` property along with CSS transitions. By setting the initial opacity to 0 and then transitioning it to 1, you achieve a fade-in effect.

<!-- BEGIN COPY / PASTE -->
    <style>
      .fade-in {
        opacity: 0;
        transition: opacity 2s ease-in;
      }

      .fade-in.show {
        opacity: 1;
      }
    </style>

    <div class="fade-in" id="content">
      This content will fade in on page load.
    </div>

    <script>
      window.addEventListener('load', function() {
        document.getElementById('content').classList.add('show');
      });
    </script>
    <!-- END COPY / PASTE -->

Additional Comment:

The `.fade-in` class sets the initial opacity to 0 and defines a transition for the opacity property.
The `.show` class changes the opacity to 1, triggering the transition.
JavaScript is used to add the `.show` class after the page has fully loaded.
Adjust the `transition` duration and timing function as needed for different effects.

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How can I use CSS to create a smooth fade-in effect on page load?

Asked on Jan 25, 2026

Answer

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