Border

There you can also customise the Border by adding:

Style: The style can be solid, dashed, dotted or double or none to make the border invisible
Colour: Used to set the color of the border
Width: The width or thickness of the border can be set as a specific size.
Corners: The corners can be set to be rounded to a certain amount as by default the corners are 90°.

Width and Corners accept a valid CSS value. For example 12px, 1.5em, calc(10vw + 8px) etc. Numerical values will be treated as pixels.