Optimize print CSS

Change-Id: I6eb07343bd41a472773245e0f0b8eede87131c91
diff --git a/css/styles.css b/css/styles.css
index 530397f..4de4af8 100644
--- a/css/styles.css
+++ b/css/styles.css
@@ -258,5 +258,23 @@
   .song {
     break-inside: avoid-page;
     box-shadow: none;
+    margin-bottom: 12px;
+    padding: 6px 12px;
+  }
+
+  .song .song-title {
+    margin-bottom: 3px;
+  }
+
+  .song .song-author {
+    margin-bottom: 6px;
+  }
+
+  .song .performers .performers-item {
+    margin-bottom: 1.5px;
+  }
+
+  #previous-concerts-btn {
+    display: none;
   }
 }