Style show/hide credentials button using the active theme

Author: ericcornelissen

styles/dialog.less

@@ -25,14 +25,14 @@
     &Button {
       position: absolute;
       background: transparent;
-      right: .2em;
+      right: .3em;
       bottom: 0;
       border: none;
-      color: #000;
+      color: @text-color-subtle;
       cursor: pointer;
 
       &:hover {
-        color: #888;
+        color: @text-color-highlight;
       }
     }
   }