Examine the CSS source code for details on using padding and border properties.
Block tag margins assigned separately to each side
Block tag margins assigned to all sides the same
Vivamus faucibus neque nec ipsum consequat congue. Test inline Tag Margins Proin ipsum lacus, placerat in condimentum at, molestie at urna. In lacinia aliquam ornare.
The <body> tag actually has margins of its own. If left to the default, this will cause a space between your page content and the edges of the viewport. Note how this page content is contained by #wrapper, which is colored light grey. Also note how the white color of the viewport is visible above and at the sides of #wrapper.
Apply margin:0px; to the <body> to remove this space.
In CSS meeting horizontal margins are added, while meeting vertical margins collapse to the largest value of the two.