Possible Values marks is specified by one of several keywords crop Crop marks indicate where the page should be cut. By default the marks of a page is none. What it does Margins are the only general properties from CSS that can be applied to pages. The margin properties set the top, left, bottom, right and all margins respectively. Possible Values Margins can be specified as either a percentage, a length or using the keyword auto.
Margins can be negative values.
A percentage margin value sets the affected margin to that percentage of the width or height of the page . We cover length values in detail in our section on values. With length values, you can set the margin to an absolute value, or a value relative to the size of the element itself. Note that because a page has no concept of fonts, the em and ex units cannot be used to set the margin of a page. If no margin value is specified, the margin of a page is zero.