Make tooltips opaque again

templates/base.html

@@ -59,6 +59,9 @@ SPDX-License-Identifier: GPL-3.0-or-later
             cursor: pointer;
             text-decoration: underline;
         }
+        .tooltip.show {
+           opacity: 1; /* opaque tooltip */
+        }
         .tooltip-inner {
             background-color: #fff;
             box-shadow: 0 .5rem 1rem rgba(0,0,0,.15);