added a sort of screen selector bar at the top of each screen

textual1/main.tcss

@@ -23,3 +23,14 @@
 #artistContainer {
     height: 100%;
 }
+
+.headerb {
+    width: 20%;
+    height: 1;
+    background: #2c2e30;
+    text-align: center;
+}
+
+#headerbs {
+    height: 1;
+}