all four margins will be 15px

top and bottom margin will be 10px, left and right margin will be 2% of the total width of the document.

top margin will be 10px, left and right margin will be 2% of the total width of the document, bottom margin will be -10px

top margin will be 10px, right margin will be 2% of the total width of the document, bottom margin will be -10px, left margin will be set by the browser