Add the following to the bottom of the stylesheet_admin_css_buttons.css file. It makes the text size for the edit/delete buttons smaller and widens up the last column for tables that use the attributes-even (and -odd) class.
Code:
.attributes-odd td:last-child, .attributes-even td:last-child { width: 12%; }
.attributes-even .button_edit, .attributes-odd .button_edit, .attributes-even .button_delete, .attributes-odd .button_delete { font-size: smaller; }