
Once you’ve set up your clonable and started pasting in Skeletons, there are a few important things to understand about how they work in practice. Think of this as your “good to know” guide for building smoothly.
Each Skeleton section comes with classes already applied. These fall into two groups:
The key rule is simple:
If you manually change a global class, next time you paste a section that includes this class, Webflow will treat it as a variation and create a duplicate (e.g., [class]label[/class] becomes [class]label 2[/class]). That leads to messy, inconsistent styling across your project.
Instead, if you want to tweak a global element (like adjusting the padding on labels), use a combo class. For example, add [class]is-custom[/class] to your [class]label[/class]. This way, the base label class stays untouched, and you can apply your custom version wherever needed — without duplication.
Section-specific classes are yours to control. You can change their properties, disconnect variables, or add custom values as needed. Because they only exist for that one section, you won’t run into duplication issues.
Skeletons also come ready for dark mode. Each color variable has both a base mode and a dark mode value. By default, Skeletons use the light theme, but you can switch any section — or even a whole page — into dark mode.
To do this, simply add the [class]theme-dark[/class] class:

This switches your project to the dark variable set automatically, as long as you’ve filled out your dark mode colors in the variables.