To specify the Border settings will be used in the browser for your HTML page, make your selections in the Border window of the Style Composer.
The Border window of the Style Composer is comprised of the following elements:
Determines which border should be styled, what type of style should be applied, the width of the border, and the color of the border.
Determines the whether your border corners will be rounded. You can style each individual corner to be rounded. You can also specify by how much they are rounded and whether all corners should be equally rounded.