remove underline from text

Please how can I remove the underline in the “load more” button? I tried adding the css below in the Custom CSS menu but nothing happens.

a:link { text-decoration: none; }
a:visited { text-decoration: none; }
a:hover { text-decoration: underline; }
a:active { text-decoration: underline; }

The page I need help with: [log in to see the link]