Do you use underlines on links?
Users expect underlined texts to be a hyperlink. You should visually differentiate links by underlining them. Of course, this is not necessary on menus, obvious links, or buttons. Never underline a text that isn't a link - Use bold or italics if you need emphasis.
The default implementation of underlines in CSS is " text-decoration:underline; ".
Another way to add look-alike underlines is by adding " border-bottom: 1px solid #000; ". In this case, you can even have a dotted underline. However, it's not recommended you use this method unless you are a designer and know what you are doing. It creates extra pixels in the interface, which can potentially cause other problems in your UI, for example: