fixed playing stuff, added cover art, added pause button

textual-take2/app.tcss

@@ -0,0 +1,13 @@
+#songs {
+    height: 50%;
+}
+
+#now-playing {
+    height: 90%;
+}
+
+#coverart {
+    height: 100%;
+    width: 100%;
+}
+