To change a style property of an individual element, select it and navigate to the Inline Styles section of the InspectorA Unity window that displays information about the currently selected GameObject, asset or project settings, allowing you to inspect and edit the values. More info
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Style fields that appear bold with a solid line on the left of the field label represent style properties that are already set, or overridden. It’s important to keep track of these overridden style properties, as they always override the same property coming from a StyleSheet or from a C# default. To unset or remove the override for a style property, right-click on the style field and choosing Unset.