UX: Update style for new PM bubbles, pin older

.discourse-compatibility

@@ -0,0 +1 @@
+2.8.0.beta3: 7947c0a702bee2df957b0b8baab3b98eb5d91bda

common/common.scss

@@ -76,3 +76,14 @@ body textarea {
 .popup-menu .btn {
   box-shadow: none;
 }
+
+// Personal messages
+
+.archetype-private_message {
+  .topic-body {
+    box-shadow: none;
+    .cooked {
+      @include boxShadow;
+    }
+  }
+}

desktop/desktop.scss

@@ -272,3 +272,14 @@
     }
   }
 }
+
+// Personal messages
+
+.archetype-private_message {
+  .topic-body {
+    margin-left: -2em;
+  }
+  .small-action {
+    max-width: 758px;
+  }
+}