fix: groups edit tabs UI

client/scss/components/v-tabs.scss

@@ -0,0 +1,10 @@
+.grad-tabs > .v-tabs-bar {
+  background-image: linear-gradient(to top, rgba(#000, .025), transparent);
+  border-bottom: 1px solid rgba(#000, .1);
+  border-radius: 4px 4px 0 0;
+
+  @at-root .theme--dark & {
+    background-image: linear-gradient(to bottom, rgba(#FFF, .05), transparent);
+    border-bottom-color: transparent;
+  }
+}