The border properties are used to format the border around elements. They can be applied to any element and they do not inherit.
To make the border visible around an element, the border-style property has to be set to a value other than none, which is the default value.
border-style (1-4) | border-top-style |border-right-style | border-bottom-style |border-left-style : none | dashed | dotted | double | groove | hidden | inset | outset | ridge | solid
The solid border style is the one most commonly used, but there are several other options for displaying a border, as seen in Figure 17-1. The hidden value removes ...