Which styling options can I change in my booster? (Essential Free Shipping Upsell app)

On the Design tab you can change the look of your booster. Product page and cart page boosters have the most options:

• Font: choose a font, or use your theme's font.
• Title and text: change the size and colour of the title and message.
• Product details: change the size and colour of the product title, price, and compare-at price.
• Progress bar: change the background and fill colours, and the corner radius.
• Background: use a single colour or a gradient, with a gradient angle from 0 to 360 degrees.
• Card: change the corner radius, border size, and border colour.
• Spacing: adjust the inside-top, inside-bottom, outside-top, and outside-bottom spacing.
• Carousel arrows: change the arrow colour.

The title's font weight is always bold, and the title cannot be hidden. The progress bar is 8 px thick, and its thickness cannot be changed, although its colours and corner radius can. Announcement bars have fewer options. They support the background, border, spacing, font, title size and colour, position, and close icon colour, but not the progress bar, product, button, arrow, or milestone settings.