The :visited CSS pseudo-class lets you select only links that have been visited. This style may be overridden by any other link-related pseudo-classes, that is :link, :hover, and :active, appearing in subsequent rules. In order to style appropriately links, you need to put the :visited rule after the :link rule but before the other ones, defined in the LVHA-order: :link — :visited — :hover — :active.

<!DOCTYPE html>
            a:visited {
                color: #F00;
            /* another style 
            a:visited {
                background-color: white;
            } */
            /* table rows with class col will collapse */
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