Strange underlines in font-awesome CSS

Question

When I hover on font-awesome\'s icons (when they\'re stacked together) like below (see picture). I get these strange underlines. Any idea where they could come from?

Answer 1

"text-decoration: none;" needs to be set with the ":hover" selector on the "a" tag, like this...

a:hover {
    text-decoration: none;
}