increase link contrast

invenio_theme_tuw/assets/semantic-ui/less/invenio_theme_tuw/theme/custom/flip-card.less

@@ -55,6 +55,7 @@
 /* Style the back side */
 .flip-card-back {
   background-color: #006699;
+  color: white;
   box-shadow: 0px 5px 5px grey;
   padding:25px;
   transform: rotateY(180deg);