A: The CSS box model is a box that surrounds every HTML element. For instance, margins, borders, padding, and content.
A: The difference between margin and padding is padding covers the area around content, where margin covers the area outside the border.
A: The height and width of a HTML element is determined by adding the padding, borders, and margins to the width and height. For instance, to get the total width of an element you must add the left and right padding, left and right border, and left and right margin to the width.
A: If you are using the CSS property padding:25px 50px; you are inserting the top and bottom paddings to be 25px and the right and left paddings to be 50px.
A: The difference between border and outline is a border is the area around the padding and content area, where outline is drawn outside the border.