This CSS effect, which I call "Raise the Curtains," creates a visually striking transition on scroll. The background shifts from dark to light, while the sticky content above transitions from light to dark.
Here's how it looks in a real-world application: [link to example - replace with actual link if available]
Ready to learn how to create this effect? Let's dive into a simple HTML and CSS implementation.
HTML Structure
For clarity, we'll use a simplified version:
<div class="curtain">
<div class="invert">
<h2>Section Title</h2>
</div>
</div>
This uses a .curtain container for the background effect, an .invert child element for the sticky content, and an <h2></h2> for the heading.
CSS Variables
We'll define CSS variables for easy customization:
:root {
--minh: 98vh;
--color1: wheat;
--color2: midnightblue;
}
These variables control the container height (--minh), light color (--color1), and dark color (--color2).
Creating the Curtain Effect
The .curtain element uses a linear gradient for the background split and min-height for extra bottom space:
.curtain {
background-image: linear-gradient(to bottom, var(--color2) 50%, var(--color1) 50%);
}
.curtain::after {
content: "";
display: block;
min-height: var(--minh);
}
The ::after pseudo-element creates the illusion of extra space, ensuring the sticky content remains within the container.
Implementing Sticky Content
The .invert class styles the sticky content:
.invert {
position: sticky;
top: 20px;
mix-blend-mode: difference;
display: flex;
align-items: center;
justify-content: center;
min-height: var(--minh);
}
h2 {
color: var(--color1);
}
position: sticky and top create the sticky effect. mix-blend-mode: difference blends the content color with the background gradient, creating the inverse effect. Flexbox centers the content.
The mix-blend-mode: difference creates an inversion effect. For a visual explanation of mix-blend-mode values, see this CSS-Tricks Almanac demo: [link to CSS-Tricks demo - replace with actual link if available].
Demo and Considerations
A live demo showcasing the effect can be found here: [link to demo - replace with actual link if available]
Important Notes:
- Images within the sticky content might not render well with color inversion. Consider using SVGs or transparent PNGs.
-
mix-blend-mode: differencedoesn't work well with certain properties liketransformon the container.
This technique offers a clean, browser-compatible solution for creating a visually appealing "Raise the Curtains" effect using only HTML and CSS. Let me know in the comments how you'd use this effect!
The above is the detailed content of How to Make a 'Raise the Curtains” Effect in CSS. For more information, please follow other related articles on the PHP Chinese website!
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