What if the element I want to adjust isn't listed in Customizable Elements?
While Squarespace does provide the most common site elements that most people will use, there are a lot more that are not shown. We don't show these because most of our users don't need to access them and we don't want to overload our users will all of them, especially if they would only rarely modify them. However, you can still add them to your style editor for modification but this requires advanced knowledge of understanding CSS. These elements can be added within the [Style Information > Advanced Settings: Customizable Elements] area of your custom style.
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