Can Webflow support additive overlay?

Yes, Webflow does support additive overlay effects. Additive overlay is a technique where you layer one image or element on top of another, and instead of hiding or replacing the underlying layer, it adds to the visual result. This can create interesting visual effects and is commonly used in design to apply filters, gradients, or textures to an element.

To achieve an additive overlay effect in Webflow, you can use a combination of CSS properties and classes. Here's a step-by-step process:

1. Create the base element: Start by adding the base element to which you want to apply the additive overlay effect, such as a section, div block, or an image. Make sure to add any necessary content or styling to this base element.

2. Add an overlay element: Create a new div block or an image element above the base element. This overlay element will be responsible for the additive overlay effect. Position it within the parent element using absolute or relative positioning.

3. Apply styling to the overlay element: Add custom CSS classes to the overlay element or modify its existing class. To create an additive effect, you'll typically use CSS properties like opacity, blend modes, or background color gradients.

For example, to create an overlay with a semi-transparent white color that adds to the base element, you can apply the following CSS to the overlay element:

```css
.overlay {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: rgba(255, 255, 255, 0.5);
mix-blend-mode: screen;
}
```

In this example, the `background-color` property sets the overlay color with an alpha value of `0.5`, making it semi-transparent. The `mix-blend-mode` property is set to `screen`, which adds the color to the underlying elements. You can experiment with different blend modes and opacity values to achieve your desired effect.

4. Adjust stacking order: By default, the overlay element might be positioned behind the base element. To bring it to the front and create the overlay effect, ensure that the overlay element has a higher `z-index` value or that it appears later in the HTML structure.

That's it! With these steps, you can create additive overlay effects in Webflow using custom CSS classes and properties. Remember to adjust the values and properties to match your desired effect and design requirements.