Css tutorial: recognition of the margin attribute

Previously, margin was used to control the spacing between boxes. When I learned css grid in the afternoon, I found that there are more margin attributes.

Reference content is as follows: Syntax: Margin: auto | length Parameters: Auto: the value of the relative edge. Length: length Value composed of floating point numbers and unit identifiers | percentage. The percentage is based on the height of the parent object. For inline objects, the left and right extension margins can be negative values.

The "percentage" in the box is useful in the layout. You can use margin-left:-100% to move the box to the leftmost of the low-level element.

Author blog: http://www.putaoshu.com/blog/