The BorderRightWidth property in the Sandbox.UI.BaseStyles class represents the border-right-width CSS property. This property allows you to specify the width of the right border of an element. The value is of type System.Nullable<Sandbox.UI.Length>, which means it can hold a Length value or be null if the property is not set.
To use the BorderRightWidth property, you can set it to a specific Length value, such as pixels, percentages, or other CSS length units. If you want to remove the right border width, you can set this property to null.
BaseStyles styles = new BaseStyles(); styles.BorderRightWidth = new Length(5, LengthUnit.Pixel); // Sets the right border width to 5 pixels styles.BorderRightWidth = null; // Removes the right border width