more button added to frontpage.html

invenio_theme_tuw/assets/semantic-ui/less/invenio_theme_tuw/theme/elements/button.overrides

 button.ui.basic.icon.button.copy.copy-to-clipboard * {
     color: gray;
 }
+
+#more-button {
+    width: 100px;
+    margin: 10px;
+}