f7723559_CSS_HTML_XHTML_Reference_Book__Description_and_notes
[Property/Values] border-style one to four of the following values: none, dotted, dashed, solid, double, groove, ridge, inset, outset, inherit [Description and notes] 
for setting only the style of a border on one or more sides of an element initial value: none; not inherited
CSS HTML XHTML Reference Book
Description and notes