adjust color in dark

src/client/styles/scss/theme/_apply-colors-dark.scss

@@ -262,6 +262,21 @@ body.on-edit {
   }
 }
 
+/*
+ * Popover
+ */
+.popover {
+  background-color: $bgcolor-global;
+  border-color: $secondary;
+  .popover-body {
+    color: inherit;
+  }
+  .arrow::after {
+    border-right-color: $secondary;
+    border-left-color: $secondary;
+  }
+}
+
 /*
  * GROWI HandsontableModal
  */