CSS styles let you control many properties that cannot be controlled using HTML alone. For example, you can assign custom list bullets and specify different font sizes and units (pixels, points, and so on). By using CSS styles and setting font sizes in pixels, you can ensure a more consistent treatment of your page layout and appearance in multiple browsers. In addition to text formatting, you can control the format and positioning of a block-level elements in a web page. For example, you can set margins, borders, float text around other text, and so on.