• CSS treeat each HTML element as if it has its own box.
• You can use CSS to control the dimentsions of a box.
• You can also control the borders, margins and padding for each box with CSS.
• It is possible to hide elements using the display and visibility properties.
• Block-level boxes can be made into inline boxes, and inline boxes made into block-level boxes.
• Legibility can be improved by controlling the width of boxes containing text and the leading.
• CSS3 has introduced the ability to create image borders and rounded borders.