CSS: Do not allow lines longer than 79 characters

In order to make the code more consistent, set a maximum of 79
characters per line in CSS files. If the CSS properties line is longer
than 79, break it and align the second line to the beginning of the
properties of the first line. If the CSS filter line is longer than 79,
break it and do not indent the second line (so it also keeps aligned to
the first line as well).

Signed-off-by: Crístian Viana <vianac@linux.vnet.ibm.com>
CSS: Change all CSS files indentation to 4 spaces

In order to make the code more consistent, all CSS files should use the
same indentation level.

Use 4 spaces to indent the CSS properties.

Signed-off-by: Crístian Viana <vianac@linux.vnet.ibm.com>