added css to make the hr elements look like they do for bootstrap w/ burnettk (#320)

Co-authored-by: jasquat <jasquat@users.noreply.github.com>

spiffworkflow-frontend/src/index.css

@@ -582,3 +582,16 @@ svg.notification-icon {
 .version-info-column {
   width: 50%;
 }
+
+/* From bootstrap _reboot.scss, people got used to this when we
+* had the bootstrap stylesheets, and they liked it.
+* Otherwise, the hr in the user profile dropdown shows up as a dot
+* and from markdown it's a little darker.
+*/
+hr {
+    border: 0;
+    border-top: 1px solid;
+    color: inherit;
+    margin: 1rem 0;
+    opacity: .25;
+}