Style: Modified some of the rick-text oriented css styling for better rendering.

app/javascript/styles/mastodon/components.scss

@@ -866,12 +866,15 @@
   h2,
   h3,
   h4,
-  h5 {
+  h5,
+  h6 {
     margin-bottom: 20px;
+    margin-top: 20px;
   }
 
   blockquote {
     white-space: normal;
+    margin-top: 20px;
 
     p:last-child {
       margin-bottom: 0;
@@ -880,6 +883,8 @@
 
   ul,
   ol {
+    margin-bottom: 5px;
+
     p {
       margin-bottom: 0;
     }
@@ -1002,13 +1007,28 @@
   }
 
   &.rich-blocks {
-    h1,
-    h2 {
-      font-size: 18px;
+    h1 {
+      font-size: 150%;
     }
 
     h2 {
-      font-size: 16px;
+      font-size: 145%;
+    }
+
+    h3 {
+      font-size: 140%;
+    }
+
+    h4 {
+      font-size: 135%;
+    }
+
+    h5 {
+      font-size: 130%;
+    }
+
+    h6 {
+      font-size: 125%;
     }
 
     blockquote {