You add a class in the Attributes tab of the element you want to set the conditional style on. Give it a name and set a formula that returns a boolean value (true or false). This should be a formula that determines if it's above/below the Price value in your instance. In the Styling tab add a new style by clicking the + next to Styles. Select the new style class you added in Attributes from the Class drop-down. Now the styles you set are applicable when the condition you set in the Class' formula are met (returns true). Only set the style properties that you want to be different eg the Font Color.
.jpeg/public)