refactor metadata

maildir_gtd/email_viewer.tcss

@@ -108,10 +108,23 @@ Markdown {
   }
 }
 
-#envelopes-list ListItem:odd {
-  background: rgb(25, 24, 26);
+#envelopes_list {
+  ListItem:odd {
+    background: rgb(45, 45, 46);
+  }
+  ListItem:even {
+    background: rgb(50, 50, 56);
+  }
+  & > ListItem {
+    &.-highlight {
+      color: $block-cursor-blurred-foreground;
+      background: $block-cursor-blurred-background;
+      text-style: $block-cursor-blurred-text-style;
+    }
+  }
 }
 
+
 #open_message_container, #create_task_container {
   dock: bottom;
   width: 100%;
@@ -126,3 +139,10 @@ Markdown {
   }
 }
 
+Label.group_header {
+  color: rgb(64,64,64);
+  text-style: bold;
+  background: rgb(64, 62, 65);
+  width: 100%;
+  padding: 0 1;
+}