The properties related to the border are as follows.

is used to set the width of the border. Options include:
1) : change the border width Set to the length value expressed in CSS measurement units (such as em, px, cm);
2) : Set the border width value to the percentage of the width of the border drawing area;
3) Thin, medium and thick: Set the border width to the default width. The specific meaning of these three values ​​​​is defined by the browser. The width represented by the three values ​​​​increases once, and the border The default value for width is medium.

is used to set the style used to draw the border, which can be any of the following values.
1) none: no border, default value;
2) dashed: dashed border;
3) dotted: Dot line border;
4) groove: groove line border;
5) inset: a border that makes the element content have an inline effect;
6) outset: a border that makes the element content have a convex effect;
7) ridge: ridge border;
8) solid: Solid border.

Set the color of the border.

Top edge
border-top-width
border -top-style
border-top-color
Bottom
border-bottom-width
border-bottom- style
border-bottom-color
left
border-left-width
border-left-style
border-left-color
right
border-right-width
border-right-style
border-right-color

Abbreviation

##border: