Show links underline on hover in Explorer

Author: Alenar

mithril-explorer/src/app/global.css

@@ -17,10 +17,13 @@ body {
 }
 
 a {
-  color: inherit;
   text-decoration: none;
 }
 
+a:hover {
+  text-decoration: underline;
+}
+
 * {
   box-sizing: border-box;
 }