one more button change

app/views/shared/snippets/_header.html.haml

@@ -45,6 +45,6 @@
                 %strong.embed-toggle-list-item Share
         %input#snippet-url-area.snippet-embed-input.form-control{ type: "text", autocomplete: 'off', value: snippet_embed }
         .input-group-btn
-          %a#clipboard-btn.btn.btn-default{ title: "Copy to clipboard", data: { toggle: "tooltip", placement: "bottom", title: "Copy source to clipboard", container: "body", clipboard_target: '#snippet-url-area' } }
+          %button#clipboard-btn.btn.btn-default{ title: "Copy to clipboard", data: { toggle: "tooltip", placement: "bottom", title: "Copy source to clipboard", container: "body", clipboard_target: '#snippet-url-area' } }
             = sprite_icon('duplicate', size: 16)
     .clearfix